U.S. Is Promoting And Funding Nuclear Thermal Propulsion For Space Craft

      In addition to this blog on the space industry, I also write a weekly blog on the nuclear issues at www.nucleotidings.com. Occasionally, I write posts that are relevant to both blogs such as today’s post on nuclear thermal propulsion.
      In a nuclear thermal propulsion system, a fission reactor is used to heat a propellant such as hydrogen which is then directed through a nozzle to provide thrust for a space craft. It is estimated that such a propulsion system could substantially reduce the duration of a deep space mission such as a trip to Mars. Early in the Space Age, NASA studied nuclear thermal propulsion only to abandon it in the early 1970s. Such research has only recently been resurrected.
     Vice President Mike Pence spoke March 26th at a National Space Council meeting in Huntsville, Alabama. He said, “As we continue to push farther into our solar system, we’ll need innovative new propulsion systems to get us there, including nuclear power. And the president and I know there’s no place on Earth better equipped to lead the world in pioneering these new propulsion technologies than Rocket City, U.S.A., a reference to a nickname for the NASA Marshall Space Flight Center in Huntsville, Alabama.
        Nuclear thermal propulsion also has support in Congress as well as in the private space industry. Jeff Thornburg is the chief executive and president of Interstellar Technologies, a private space company. He used to be a propulsion executive at SpaceX and Stratolaunch. At the May 22 Space Tech Expo in Pasadena California, he said, “Nuclear propulsion is key to exploiting our capabilities beyond low Earth orbit. There’s some key technology development that really needs to happen beyond the current state of the art.” He said that nuclear thermal propulsion integrated with electrical propulsion was the key to facilitating the expansion of nuclear thermal propulsion.
       Thornburg admitted that there were regulatory issues with nuclear thermal propulsion beyond purely technical challenges whether the nuclear thermal propulsion systems were developed and operated by government or private space industry. He also said that recent comments at the March meeting of the National Space Council by the Director of the Office of Science and Technology Policy about reviewing nuclear propulsion were encouraging.
       It is not clear exactly how nuclear thermal propulsion fits into the long-term exploration plans of NASA. Roadmaps for NASA exploration as well as many roadmaps developed by the private space industry rely on conventional propulsion systems such as chemical and solar electrical propulsion. While these system do not offer the same reduced travel times as nuclear thermal propulsion, they also do not present the same technical and regulatory challenges. None of the list of proposed NASA missions through 2028 specifically call for nuclear thermal propulsion.
      In 2019, the U.S. Congress provided one hundred million dollars for work on nuclear thermal propulsion. Seventy million dollars out of the hundred million dollars was earmarked for a flight demonstration of nuclear thermal propulsion in 2024.

NASA Awards Three Contracts For Private Companies To Deliver Payloads To The Moon

      NASA has just announced that it has awarded contracts to three companies to carry payloads of scientific instruments to the Moon in 2020 and 2021. No private company has ever successfully landed a probe on the Moon. The last time the U.S. space program landed anything on the Moon was forty-six years ago.  With these new contracts, NASA is moving forward on its promise to use commercial space companies to assist in the U.S. exploration of the Moon.
      This new program was formerly called Commercial Payload Services. It represents the start of a decade-long project for NASA to return to the Moon. One of the goals of this new program is to establish a permanent manned base on the surface of the Moon. Another goal is to analyze potential of the lunar surface with respect to possible human activities. A third goal is to assess the possibility of utilizing resources present on or near the lunar surface.
        Thomas Zurbuchen is the head of NASA’s science programs. He said,  “The most important goal we have right now is really science, but we do so as part of the agency’s strategy to go to the Moon. We want to do it with partners. We want to not only go there, but to grow an industry. That’s the only way we can stay.”
       Orbit Beyond (OB) is a private space company that is located in New Jersey. OB has signed a ninety-seven million dollar contract to send its Z-01 lander to a lava plain that is about thirty degrees north of the lunar equator in September of 2020. The OB space craft will be launched on a SpaceX Falcon 9 rocket along with other satellites. Jon Morse is the chief science officer for OB. He said, “People want to understand how close you can put a habitat to a landing site. When we do this descent, and we get this imagery, scientists can study the trajectory of those plumes.”
      Astrobotics (AB) is a private space company located in Pennsylvania. They signed an eighty million dollar contract to deliver up to fourteen payloads to a big crater on the near side of the Moon named Lacus Mortis. The AB payloads will be launched by either Falcon 9 or Atlas V rockets in 2021.
       Intuitive Machines is a private space company located in Texas. IM was awarded seventy seven million dollars to ferry up to five payloads to an interesting lunar location called Oceanus Procellarum. This mission will launch on a Falcon 9 rocket sometime in 2021.
        The big challenge for these contracts is whether or not private space companies can successfully land payloads on the Moon. Representatives of each of the three companies contracted by NASA said that they were working hard to balance system redundancy in their payloads with constraints based on mass and cost of payloads.
       NASA had previously said that these missions were “shots on goal” implying that some of them might not be successful. However, the NASA Deputy Associate Administrator for Exploration said last Friday that his “confidence is high that these three companies will succeed.”

NASA To Award Contracts To Eleven Companies To Work On Lunar Exploration

       On May 16th, NASA announced that forty-five and a half million dollars is going to be awarded to eleven companies under the terms of NextSTEP E contracts. NASA has been developing a plan for manned lunar exploration. A space station dubbed the Gateway will be placed in orbit around the Moon. Ascent and descent elements will be developed to move astronauts from the lunar surface to the Gateway and from the Gateway to the lunar surface. The vehicles will need refueling which will probably involve the use of hydrogen generated from lunar ice.
        Marshall Smith is the director for human lunar exploration programs at NASA Headquarters. He said, “To accelerate our return to the moon, we are challenging our traditional ways of doing business. We will streamline everything from procurement to partnerships to hardware development and even operations. Our team is excited to get back to the moon quickly as possible, and our public/private partnerships to study human landing systems are an important step in that process.”
       This NASA program will require that the selected companies provide at least twenty percent of the cost of their contracts. There will be contracts for concept studies and prototypes will have a six-month term. To speed up this process, NASA has told companies that they can go ahead and get started while the contracts are being negotiated.
Blue Origin: Will carry out studies on the descent element and the transfer vehicle.
Aerojet Rocketdyne, Canoga Park, Calif.: Will carry out one transfer vehicle study.
Boeing, Houston: Will carry out one descent element study, one transfer vehicle study, one refueling element study. Will construct two descent element prototypes, one transfer vehicle prototype, and one refueling element prototype.
Dynetics, Huntsville, Ala.: Will carry out one descent element study and construct five descent element prototypes.
Lockheed Martin, Littleton, Colo.: Will carry out one descent element study, one transfer vehicle study, one refueling element study and construct four descent element prototypes.
Masten Space Systems, Mojave, Calif.: Will construct one descent element prototype.
Northrop Grumman Innovation Systems, Dulles, Va.: Will carry out one descent element study and one refueling element study, and construct four descent element prototypes, and one refueling element prototype.
OrbitBeyond, Edison, N.J.: Will construct two refueling element prototypes.
Sierra Nevada Corp., Louisville, Colo., and Madison, Wis.: Will carry out one descent element study, one transfer vehicle study one and one refueling element study. Will construct one descent element prototype andT one transfer vehicle prototype.
SpaceX, Hawthorne, Calif.: Will carry out one descent element study.
SSL, Palo Alto, Calif.: Will carry out one refueling element study and construct one refueling element prototype.
        NASA considers the hardware being developed for transporting astronauts from Earth to the Gateway and from the Gateway to Earth to be separate from the project to develop a system to move astronauts between the Gateway and the Moon.
         There will be another solicitation referred to as NextSTEP H issued this summer for the purpose of developing the requirements for a manned mission to the Moon by 2024. Greg Chavers is the human landing system formulation manager at NASA’s Marshall Space Flight Center in Alabama. He said, “This new approach doesn’t prescribe a specific design or number of elements for the human landing system. NASA needs the system to get our astronauts on the surface and return them home safely, and we’re leaving a lot of the specifics to our commercial partners.”

Boring Tunnels On The Moon

        With President Trump and Vice President Pence publicly pushing for a U.S. manned landing on the Moon in the next five years, there is a lot discussion of lunar exploration in the popular press. Ultimately, the companies and nations interested in the exploring the moon want to build permanent manned bases there. This will require either the construction of buildings or the excavation of tunnels to provide shelter for lunar colonists.
        Jamal Rostami is the Director of the Earth Mechanics Institute at the US Colorado School of Mines. He recently attended the World Tunnel Congress in Naples, Italy. He said, “Space is becoming a passion for a lot of people again. There are discussions about going back to the moon, this time to stay.” In order for humans to live safely on the moon, they must be protected from solar and cosmic radiation, freezing temperatures and meteor strikes.”
      "Imagine something the size of my fist as a piece of rock coming at 10-12 kilometers (6-7 miles) per second, it can hit anything and would immediately destroy it. So every plan for having a habitat on the moon involves making a trench, creating a structure and covering it with some sort of regolith, which is the soil on the moon. Our idea is to actually start underground, using a mechanism we already use on the earth, a tunnel boring machine, to make a continuous opening to create habitats or connect the colonies together.”
       Analyses of photographs of the surface of the moon show openings that lead to huge lava tubes that could house whole cities. A tunnel boring machine could be used to dig habitable tunnels between the lava tubes. The big problems is how to get a huge tunnel boring machine to the Moon.
       When you are sending anything to the Moon, Rostami says that "Weight is an issue. It's pretty expensive to take a kilogram of material from the earth to the moon. Our machines are hundreds of tons of mass, so it's not feasible to take the machines as they are. We have to convert the design, where all the components are optimized, weigh much less, and perform better.” The tunnel boring machines will have to be redesigned to be fully automatic and any necessary repairs will need to minimized. This will be difficult because of the wear and tear on cutting components as they chew through rocks and dirt.”
        Another big problem for lunar tunneling machines will be their source of power. A conventional tunnel boring machine with a thirteen feet diameter needs around two thousand kilowatts of power. The possibility of small nuclear reactors to power the lunar tunneling machines has been raised. (NASA is already working on a compact self-contained nuclear reactor for possible use on Mars.)
       Space enthusiasts at the United Launch Alliance suggest that a thousand people may be living in space by 2050. They would either be in orbital space stations or lunar habitats. It is estimated that this initial phase of space colonization will cost around three trillion dollars. While it is possible the lunar tunneling machines could be used to explore for and extract precious minerals such as gold from the lunar surface, the first and most precious resource that must be secured is water.
       Rostami says, “The first target is water. We know there is trapped water at the lunar poles, where the temperature is as low as -190 degrees Celsius (-310 Fahrenheit). One of the ideas being discussed is of heating the part in permanent shadow, evaporating the water and capturing it. Another idea is to mine it and take it to a facility and let it thaw. The material extracted along with the water can then be used to 3D print buildings in the colonies. The future lunar tunneling machines will undergo rigorous pilot testing on Earth first because once they are deployed, that's that. It'll be very difficult to make any drastic changes”.

Sapa Profiles Supplied Poor Quality Parts To NASA For Twenty Years

        In addition to writing this weekly blog on space issues, I write a blog about nuclear issues every week day. In my nuclear blog, I have often talked about the greed and incompetence of some companies in the nuclear industry. Le Creuset is a French Company that sold nuclear components and reactor vessels made of substandard steel for decades before they were caught. I am sad to say that the new space industry is not free from such problems.
        Following the 2009 failure of the launch of the Orbiting Carbon Observatory and the failure of the launch of 2011 launch of the Glory missions, NASA went to their Launch Services Program (LSP) and the Department of Justice (DoJ) to find out what went wrong. At first, NASA had just said that their launch vehicle malfunctioned. Apparently, the nose cones on the Taurus XL rockets used to launch the failed missions had malfunctioned. But NASA kept digging into the cause of the malfunctions.
       The investigators found that the fairings (nose cones) on the rockets did not separate because failure of the aluminum extrusions for a part called the payload fairing rail frangible joint. This part is an explosive separation device that is intended to insure that the fairing separates cleanly from the rocket and falls away from it.
       Sapa Profiles (SP) provided aluminum parts to NASA for the construction of the fairings. The joint investigation of the LSP and the DoJ found that SP had been engaged in fraudulent behavior for almost twenty years. Workers at SP would falsify test numbers or violate testing standards to make it appear as if their poor-quality parts had passed aluminum certification. The company would then present the fake certificates to NASA.
        Apparently, SP wanted to make profits by making substandard parts and faking certification. They used production based bonuses to entice employees to do anything that would speed up production. Millions of dollars of satellite equipment made by SP were so faulty that they were unable to successfully complete their intended missions in space and ultimately sustained damage.
       SP has changed its name to Hydro Extrusion Portland and agreed to pay the U.S. government forty-six million dollars. Unfortunately, this does not even come close to the seven hundred million dollars lost by NASA as a result of the failure of Taurus launches. SP, under its new name will not be allowed to ever do business with the U.S. government again. At least their fraudulent behavior will not endanger any more rocket launches.
       It is interesting to note that the problem at SP is very similar to the problem at Le Creuset. Both companies falsified quality control documentation for their alloys and then used the false documents to support sales and profits. While the damage done by bad SP parts did not have the possibility of the horrible damage that could have been done by failure of Le Creuset parts, they still wasted a lot of money and the failed satellite launches add to the debris in orbit which is already causing problems for the for NASA and private space companies. Hopefully, NASA will be more careful about sourcing its components in the future.

Purdue University Team Working On Graphene Foam For Solid Rocket Fuels

        Graphene is form of carbon where a single layer of carbon atoms is laid out in a hexagonal grid. Graphene has many amazing properties. It is the strongest material ever tested. It can conduct electricity and heat efficiently. It is almost transparent and yet it is surprisingly opaque for a material that is only a single atom thick. Graphene has a large and nonlinear diamagnetism and can be levitated by neodymium magnets. Although graphene has been produced for use in graphite applications such as pencils for centuries, it was isolated and characterized by researchers at the University of Manchester in 2004.
         Graphene foam is created by vapor deposition on a metal foam, a three-dimensional mesh of metal filaments which are then removed, leaving a foam structure composed of graphene. Graphene foams have found use in electrodes for very efficient batteries.         
          Purdue University's Maurice J. Zucrow Laboratories is the largest academic propulsion lab in the world. Li Qiao is an associate professor of aeronautics and astronautics in Purdue’s College of Engineering. His team is working on a new solid propellant based on graphene foam for use in rocket engines. Their goal was to increase the burn rate of the solid fuel. Li said, “Our propulsion and physics researchers came together to focus on a material that has not previously been used in rocket propulsion, and it is demonstrating strong results.”
          Li’s team is researching methods of creating and using composites that consist of conductive highly porous graphene foams loaded with solid fuels. The foams enhance the burn rate for the solid fuels that have been loaded into the foam. The team had a goal of maximizing the catalytic effect of metal oxides additives that are commonly used in solid propellants in order to facilitate decomposition. Their foam structures are thermally stable at high temperatures and can be reused by reloading solid fuel into the foam to replace the fuel that has burned.
         The graphene foam works very well for solid propellants because it is extremely lightweight and highly porous. This mean that it has many holes in which engineers can load fuels to ignite a rocket launch. The foam has a 3D interconnected structure which allows for a more efficient thermal transport pathway. This allows heat to spread quickly to ignite the propellant loaded into the foam.
        Li Qiao said that “Our patented technology provides higher performance that is especially important when looking at areas such as hypersonics. Our tests showed a burn rate enhancement of nine times the normal, using functionalized graphene foam structures.” Li Qiao says that the Purdue graphene foam research has applications for energy conversion devices and missile defense systems. There also other areas where tailoring nanomaterials for specific purposes can very useful.
Li Qiao and his team are working with the Purdue Research Foundation Office of Technological Commercialization (OTC) in order to patent the new technologies they have developed. They are currently seeking partners to license the new technology. The OTC “operates one of the most comprehensive technology transfer programs among leading research universities in the U.S. Services provided by this office support the economic development initiatives of Purdue University and benefit the university's academic activities.”

PepsiCo Backs Down From Announced Billboard In The Sky

      There are many practical reasons to launch satellites including Earth sensing, astronomy, preparing for deep space missions, carrying out low gravity research on chemistry and biology, etc. There are also strategic reasons such as control, command and communication of men and equipment on the ground during war as well as placing weapons in orbit for use in conflict. Then there are some reasons that do not appear to be quite so useful.
      It was first reported back in January of 2019 that StartRocket, a Russian aerospace company, announced that it intends to launch a bunch of cubesats into Earth orbit that can act as an “orbital billboard.” The billboard would be used to project huge advertisements into the night sky, sort of like artificial constellations. The cubesats would unfurl pieces of highly reflective Mylar which would be manipulated to reflect light to the Earth in early mornings and/or evenings. Just what the world needs, more public advertising.
      StartRocket said a few days ago that PepsiCo will be its first client. Pepsi will use the orbiting billboard to support its new energy drink called Adrenaline Rush through a “campaign against stereotypes and unjustified prejudices against gamers.”
      Olga Mangova is a spokesperson for Russian PepsiCo. She confirmed that the stories about PepsiCo contracting StartRocket are true. She sent an email which said, “We believe in StartRocket potential. Orbital billboards are the revolution on the market of communications. That’s why on behalf of Adrenaline Rush — PepsiCo Russia energy non-alcoholic drink, which is brand innovator, and supports everything new, and non-standard — we agreed on this partnership.”
       Vlad Sitnikov is the project leader for the PepsiCo campaign. He said “We are ruled by brands and events such as the Super Bowl, Coca Cola, Brexit, the Olympics, Mercedes, FIFA, Supreme and the Mexican wall. The economy is the blood system of society. Entertainment and advertising are at its heart.”
        StartRocket recently tested its idea by attaching one of its reflectors to a helium weather balloon that carried it into the stratosphere. The light from the reflector was visible from the ground. StartRocket intends to launch its cubesat into orbit in 2021. It is currently raising funds to pay for the cubesats and launches. A twenty-thousand dollar investment will pay for eight hours of advertising in the night sky.
        There were many negative reactions to the announced plans of StartRocket. They consider the idea of orbital advertisements as a form of sky pollution. An astronomer at the University of Michigan said, “Launching art projects like this with no commercial, scientific, or national security value seems unwise.”
       Apparently, the backlash to the announcement of the project intimidated PepsiCo. A few days after the PepsiCo project was announced, PepsiCo says that it has no intentions of doing anything more with the concept of orbital advertising that the launch of the balloon to test the idea. A PepsiCo spokesperson made a public statement that “This was a one-time event; we have no further plans to test or commercially use this technology at this time.”
       When contacted about this reversal on the part of PepsiCo, StartRocket representatives were confused by the new PepsiCo position. I am relieved that we have escaped being bombarded by ads in the sky for the time being. Unfortunately, it is probably only a matter of time until someone does it.

Conflict In Orbit - Part 2 of 2 parts

Part 2 of 2 Parts (Please read Part 1 first)
       Beyond concerns about space debris, there are worries expressed by national governments and international regulatory bodies that the current view of space as a neutral and conflict-free zone is being eroded by ASAT tests. This may mark a serious decline in global security.
       There are five main international global space treaties that have been in force for up to fifty years.
• Outer Space Treaty (1967) – governs the activities of the states in exploration and use of outer space
• Rescue Agreement (1968) – relates to the rescue and return of astronauts, and return of launched objects
• Liability Convention (1972) – governs damage caused by space objects
• Registration Convention (1967) – relates to registration of objects in space
• Moon Agreement (1984) – governs the activities of states on the Moon and other celestial bodies.
      When these treaties were written and ratified, there were only a few space faring nations and the technology was primitive by today’s standards. Many import issues were left unresolved by these treaties. The deployment of weapons of mass destruction in orbit by any of the signatories is prohibited. However, powerful conventional weapons such as the non-nuclear ballistic missile used in the Indian test are not prohibited.
      The treaties says that space shall only be used for “peaceful purposes.” Unfortunately, whenever lawyers are involved, you have to be very careful about the exact meaning of words in laws and treaties. After the successful ASAT missile test, India released a statement that said that “we have always maintained that space must be used only for peaceful purposes.” The fact that India could conduct such a test and then make such a claim means that new treaties must be developed that more fully define terms such as “peaceful purposes.”
       Work on new space treaties is being carried out in a number of places. At McGill University in Canada, the MILAMOS project is trying to develop a set of fundamental rules of the military use of outer space. The Woomera Manual is a project of the Adelaide Law School in Australia. As important as these projects are, they can only result in “soft laws” which are not binding on any of the space faring nations. The U.N. should be more involved in working on space security issues. Both the U.N. Disarmament Commission and the U.N. Committee on the Peaceful Uses of Outer Space should be pressured to devote more resources to the discussion of the use of weapons in orbit.
       To be honest, I am afraid that there is just no way that powerful weapons will not find their way to Earth orbit if they are not already there. There is no global inspection of payloads that are launched into Earth orbit. There are powerful space faring nations that fear each other. I am certain that the international space treaties do not intimidate them and that they would consider it a dereliction of duty not to send secret caches of weapons to orbit “just in case.”
       There is no satisfactory solution to this problem. There will be weapons in orbit and they will be used someday. All we can do is work on diplomacy here on Earth to try to prevent a war that spreads to the heavens.

Conflict In Orbit - Part 1 of 2 Parts

Part 1 of 2 Parts
    In my last couple of posts, I talked about the dangers of attacks on U.S. military satellites and how it could hamper our ability to detected missiles launches from enemies. While I was working on these posts, there were news stories about India’s experiment with an antisatellite missile that they used to shoot down one of their own satellites.
       The Indian space program is not as big, sophisticated or as well funded as the space programs of some of the big industrial nations such as the U.S., Russia, China, and the European union. Nonetheless, they have done quite well with their limited resources and have been launching their own rockets and satellites for years now.
       On March 27 of this year, India reported that it had carried out an antisatellite (ASAT) missile test that they called “Mission Shakti”. (Shakti is a Hindu goddess.) With this successful test, India becomes the fourth nation to demonstrate the capability to use a missile to destroy an orbiting satellite. There was concern among space faring nations that, as a result of the test, over four hundred new pieces of space debris were generated and that some of this debris might threaten the International Space Station.
        The type of attack utilized by India to destroy one of its own satellites is called a “kinetic kill” or “hit to kill” attack. The Indian ASAT missile did not have any explosives aboard. The orbiting satellite was destroyed when the ASAT missile crashed into it. This is only one of several ways that an ASAT missile can destroy a satellite in orbit. China used this same technique when it carried out a successful ASAT missile test in 2007, destroying one of their old weather satellites.
        Replying to complaints about the space debris generated by their test, India argued that it had conducted the test in the lower atmosphere where the debris would pose less risk because it would burn up. Critics of the test say that India did not properly account for the creation of pieces of debris that were smaller than two inches in diameter and less likely to burn up. Space debris can collide with other space debris and break up to form more even pieces. Space debris can travel at up to six miles per second in the lower atmosphere and even a very small piece could cause problems for operational satellites.
       There are almost two thousand operational satellites in orbit around the Earth today. They provide a variety of services to the world including aid to navigation, global communication, weather forecasting, resource tracking, climate change analysis, disaster relief and many others. While these peaceful uses of Earth orbit are of great benefit, satellites can also be used for military purposes such as employing the global civilian GPS systems for targeting missiles. Satellites launched for strictly military purposes include command, control and communications for military operations as well as early warning systems for enemy missile launches. The military uses of satellites make them prime targets in case of a conflict breaks out between space-faring nations.
Please read Part 2

U.S. Military Satellites Are Vulnerable To Attack - Part 2 of 2 Parts

Part 2 of 2 Parts (Please read Part 1 first)
       Recently the Air Force’s National Air and Space Intelligence Center and the Office of the Secretary Defense’s 2019 Missile Defense Review issued a report that concluded the same thing as a recent Defense Intelligence Agency which said “China [as well as Russia] is developing sophisticated on-orbit capabilities, such as satellite inspection and repair, at least some of which could also function as a weapon.”
       These recent reports as well as other earlier reports suggest that there are four ways that adversary counterspace capabilities could be mitigated. Unfortunately, even if all four of these suggested actions were implemented, they would not necessarily protect our constellations of SBIRSs and AEHFs during the 2020s.
       Diplomacy is the first line of defense. Hostile foreign nations are unlikely to be swayed by diplomatic approaches given the increasingly contentious international environment we currently find ourselves in.
       Dispersion of space assets would be a way to reduce their vulnerability. Unfortunately, even an accelerated schedule of launch and deployment would leave vulnerabilities in place for much of the 2020s.
        Rapid space reconstitution capabilities could replace damaged or destroyed military satellites but would be far too expensive and/or slow to quickly restore lost capabilities.
         Suppression of adversarial counterspace capabilities would be effective but should only be used as a last resort. The Mitchell/MITRE report said that “the DoD should formulate operational concepts to attack adversary counterspace assets such as launch facilities, space command and control nodes, ground-based anti-satellite laser facilities, and other related infrastructure.”
      Some analysts think that we should develop “bodyguard” satellites and send them up to rendezvous with and protect important U.S. satellites such as the SBIRSs and AEHFs. The proponents of these bodyguard satellites suggest that they should have the same capabilities as the “peaceful” maintenance satellites operated by the U.S. and possible enemies such as Russian and China. In addition to these bodyguard satellites there is a general consensus that the U.S. should continue to develop defensive weapons that could be carried by future versions of the SBIRSs and AEHFs. The development of such weaponry should be sensitive to the development of ASAT weapons by our potential enemies. It would not be a good idea to trigger another arms race in orbit.
       The bodyguard satellites would be able to block, disable or destroy an enemy ASAT as well as maintenance satellites if they were attacking U.S. orbital assets. The bodyguards would not even have to destroy the attacking enemy satelliteweapons. They could just render them inoperative by damaging antenna, engines, etc. This would reduce the amount of debris in orbit which would increase if the attacking weapons were blown up.
       In addition to directly engaging ASAT weapons, the bodyguards could protect satellites from ASAT attacks by releasing decoys in the path of the ASAT missiles, jamming their command, control and communication links or blinding their sensors.
       If there is a delay in the deployment of the next generation SBIRSs and AEHFs or if the new generation does not perform to expectations or new weapons systems are developed by potential enemies that could pose new threats to the SBIRSs and AEHFs, the U.S. would be well served by the bodyguard satellites providing an extra layer of protection for military satellites.

U.S. Military Satellites Are Vulnerable To Attack - Part 1 of 2 Parts

Part 1 of 2 Parts
       Nuclear deterrence depends on being able to detect the launch of nuclear missiles from an enemy as quickly as possible. Long range radar can provide some warning but the best detection system depends on satellites. The military also expects to rely on satellites for global command, control, and communication to coordinate military activities. Analysts say that these two critical satellite systems are vulnerable in the short term.
        A few weeks ago, the Mitchell Institute for Aerospace Studies and the MITRE Corporation distributed a report that said, “when it comes to nuclear modernization, NC3 [nuclear command, control and communications] is the least expensive, yet perhaps the most critical.” Regardless of the number of nuclear warheads possessed by the U.S. as compared to the nuclear arsenals of Russia and China, if our military satellites are destroyed, we would be deaf, dumb and blind. This would not be of any assistance in convincing an enemy that we have a functional system of nuclear deterrence.
       The report also says that the, “most disturbing and profound [vulnerability] is the end of space as a sanctuary domain – space is likely to be a battleground, with space assets vulnerable to attack.” A year ago, U.S. Air Force Secretary Heather Wilson visited the Mitched Institute. At that time she commented that the big Space Based Infrared System (SBIRS) satellites that provide early warning on missile launches are vulnerable to electronic and kinetic attacks. Air Force Advanced Extremely High Frequency (AEHF) which are critical for military communications in a nuclear-disrupted environment are also vulnerable.
        The SBIRS and AEHF satellites constellation consist of only six satellites each. They are big as school buses and very expensive at almost two billion dollars each. New versions of both of these types of satellites are in the planning stages and are scheduled to be launched around 2030. This means that the current constellations of SBIRSs and AEHFs must be protected from kinetic and electronic attacks for the next decade.
       In 2007, China successfully tested its ground-based direct-ascent anti-satellite (ASAT). China also launched a missile to simulate an ASAT flight profile that flew almost to geosynchronous orbit. This is worrying to the U.S. because the U.S. SBIRS and AEHF satellites constellation are in geosynchronous orbit.
       Just this week, India made a surprise launch of an ASAT that successfully destroyed an Indian satellite. It was a direct kill kinetic weapon that collided with the target satellite, causing it to disintegrate. Such actions increase the orbital debris field.
       In the early 2020s, Russia, China, the U.S. and the E.U. will be launching orbital robots for peaceful missions that include removing space debris from orbit and maintaining satellites. The problem with this is that these maintenance satellites could also be used to rendezvous with a U.S. military satellite and disable or destroy it. So the U.S. must have ways to protect its military satellite constellations from such automated maintenance systems.
Please read Part 2

Tethers Unlimited Has Just Announced A Successful Test Of Its SWIFT-SX Software Radio

        Tethers Unlimited is a U.S. private aerospace company with its headquarters in Bothell, Washington. They carry out research and development of new products and technologies for space, sea, and air. TU was founded in 1994 to research and develop space tether technology. Applications of space tethers include removal of orbital debris and momentum exchange tethers for moving payloads to higher orbits. Space tethers enjoyed a brief popularity in the space industry community, but interest has fallen off since the 1990s.
        In order to survive, TU branched out into other space technologies including power propulsion, actuation and communications for small satellites, robotic technologies for orbital fabrication and assembly, optical fiber winding and deployment, software defined radio communication and 3D printed radiation shielding.
        In December of 2018, TU delivered a 3D printer to the International Space Station for testing. Firmamentum, a division of TU, is currently working on its “Spiderfab” technology to “enable on-orbit fabrication of large spacecraft components such as antennas, solar panels, trusses, and other multifunctional structures.”
        TU has developed the SWIFT-SLX software defined radio system. U. S. satellites must be assigned frequencies by a federal agency before launch. The conventional approach has been to insert a frequency specific crystal in the radio once the frequency has been assigned. A big problem with this approach has been that the frequency assignment process runs parallel to the construction of the satellite and sometimes, the frequency is not assigned until the last moment. This means that the engineers have to open up the satellite and insert the frequency chip just before launch which is risky.
       The SWIFT-SLX takes a different approach. The operating frequency of the radio is determined by onboard software. This means the frequency can be easily set any time before the satellite is launched. It can also be changed after launch while the satellite is in orbit.
       The SWIFT-SLX is designed to fit within a cubesat satellite. Cubesats are based on a unit cube four inches on a side and are launched as secondary payloads with big satellites. The SWIFT-SLX can be configured for a variety of mission needs. It can adjust operating frequencies in the S and L band communication channels while in orbit. The development of the SWIFT-SLX was aided by Small Business Innovation Research grants from the Air Force Research Laboratory and the Army Space and Missile Defense Center.
        TU has just announced a successful test of two-way radio communication between the Earth and an orbiting satellite carried out by the TU SWIFT-SLX radio. The test allowed communication between Harris Corporation’s first small satellite, the HSAT-1, and satellite ground control. The HSAT was launched last November by India’s Polar Satellite Launch Vehicle.
        Rob Hoyt is the CEO of TU. He said, “Our team has worked very hard to bring the SWIFT radios to the level of maturity and quality necessary to meet the needs of top-tier customers such as Harris Corp. The great performance of the SWIFT-SLX right out of the gate is a big testament to our SWIFT team’s efforts and the collaborative support of the Harris integration team.”

Trump Administration Is Pressing NASA And NASA Is Pressing Boeing For 2020 Moon Mission - Part 2 of 2 Parts

Part 2 of 2 Parts (Please read Part 1 first)
       Boeing has been criticized for years for the way it was handling the SLS project. Last year, the NASA inspector general delivered a harsh report criticizing Boeing. The report stated that Boeing had already spent five billion three hundred million dollars and is expected to spend the rest of the allocated money by the end of this year three years before the program was supposed to be completed. So far the project has been delayed for two and a half years and four billion dollars of cost overruns have been racked up. The report also said that Boeing had consistently underestimated the scope of the work that had to be done.
       John Shannon is Boeing’s SLS program manager. He has admitted that there have been a lot of problems in the program but claims that progress is being made. He said, “We’re late and I completely own that, but we are dialed in now and the team is producing extremely well. I have high confidence that we’re going to come out with an amazing capability by the end of the year, and I can’t wait to get to that point.”
       In 2017, the NASA agency watchdog said that NASA had spent a total of fifteen billion dollars so far on the SLS launch vehicle, the Orion crew capsule and the necessary ground systems between 2012 and 2016. It has been estimated that the ultimate cost may reach as high as twenty-three billion dollars. The construction of the SLS and the Orion spacecraft has been parceled out so that every state in the Union now has jobs related to the EM-1 program. All in all, the SLS program supports around twenty-five thousand jobs nationwide. It has had a total economic impact of four billion seven hundred million dollars.
      The widespread impact of the SLS program has resulted in strong support in Congress. Some critics have referred to the SLS program sarcastically as the “Senate Launch System.” Boeing is the primary contractor but Aerojet Rocketdyne, Northrop Grumman and the United Launch Alliance are also key contractors. Senator Shelby’s home state of Alabama has benefitted more than any other state from the SLS program. Alabama is the home of NASA’s Marshall Space Flight Center in Huntsville. The SLS program has brought Alabama thirteen thousand jobs and two billion four hundred million dollars.
       When the NASA administer raised the idea at the hearing that perhaps the SLS program should be tabled, Senator Shelby said, “While I agree that the delay in the SLS launch schedule is unacceptable, I firmly believe that SLS should launch the Orion.” Following this statement by Shelby, Brindstine said that NASA is committed to building and launching the SLS. The next day, Bridnstine tweeted “Good news: The NASA and Boeing teams are working overtime to accelerate the launch schedule of the NASA SLS.
       Critics of the SLS point out that it has been in development for so long that its mission has changed several times and it is based on obsolete technology that has been replaced by advances in the private space sector. The commercial launch industry has been growing beyond the big companies that have supported NASA programs with their hardware in the past. Companies like SpaceX and Blue Orion have been building and launching reusable rockets, boosters and engines which have seriously reduced costs. The SpaceX Heavy Launch vehicle costs about a hundred million to launch. For contrast, it is estimated that the launch of the SLS will cost about a billion dollars per launch.
       NASA has been considering replacing the SLS with two commercial launch vehicles. One would send the Orion crewed spacecraft into Earth orbit and the other rocket would carry the Orion to orbit the Moon after Orion docked. Brindstine says that this approach would not be optimum but might be necessary to make the 2020 deadline. NASA has been working on speeding up the schedule for the SLS. The ultimate choice for launch vehicle has not yet been made.

Trump Administration Is Pressing NASA And NASA Is Pressing Boeing For 2020 Moon Mission - Part 1 of 2 Parts

Part 1 of 2 Parts
      On big national projects there may be friction between politicians who want to show off a new ship, missile, tank, etc. and the engineers who have to build it and sign off it its completion. Sometimes this has led to embarrassment when the demonstration is not successful because the politicians rushed the engineers. We may be headed for just such a situation here in the United States.
      The Trump administration wants to demonstrate advancement in their agenda to return to the Moon to create a permanent settlement. They have been pressing NASA to show some progress before the 2020 presidential election such as sending an unmanned capsule around the Moon and returning it to Earth. NASA, in turn, is pressing contractors like Boeing to get the demo flight ready by 2020 and there are problems.
       The launch vehicle that Boeing has been building for NASA is now years behind schedule and billions of dollars over budget. Boeing has notified NASA that there is just no way that the system will be ready for launch by 2020. Currently there is an estimate that the vehicle might be ready to launch by November 2021. Reportedly, NASA was furious when notified that Boeing would miss the 2020 deadline.
       There was a hearing on March 13th at the Senate Commerce, Science and Transportation Committee. The NASA administrator Jim Bridenstine said that NASA would consider shelving the massive Space Launch System for lunar missions being built by Boeing and instead they may use commercially available launch services for the Exploration Mission-1 (EM-1) lunar mission in 2020.
       Senator Richard C. Shelby (R-Ala.) is chairman of the appropriation committee and has been the chief Congressional supporter of the Boeing SLS project which has brought a lot of jobs and money to Alabama. Political pressure has kept the dollars flowing to the SLS project in spite of delays and cost overruns. Critics have taken the opportunity provided by the status of the SLS project to attack the rubber stamp attitude of Congress for Boeing and the SLS.
        The announcement by the NASA administrator rattled the U.S. space industry. NASA may radically change its approach to launch space missions. The reputation of NASA will suffer because of this major problem with the NASA flagship rocket program and Boeing, its main contractor. It does not help Boeing to have these criticisms surface at the same time as Boeing is being attacked for the crash of two of its 737 airliners. One of the main questions raised at the hearing was whether or not NASA needs to construct and own a heavy-lift rocket. The private space sector already has launch vehicles in operation. They may not have the capacity of the SLS but they are much cheaper to operate and can reuse some components. Some companies are working on rockets that could rival the SLS in launch capacity. The latest budget request from the Trump administration includes mention of a commercial rocket replacing the SLS in a planned mission to send a robotic probe to Europa, a moon of Jupiter that may harbor life.
       The Trump budget also requests the use of commercial launch vehicles to place a new space station called the Gateway in an orbit around the Moon. Bridenstine also testified that commercial space vehicles could be used to ferry astronauts to the Gateway station. A planned mission to use the SLS to haul an asteroid into lunar orbit for investigation has been cancelled.
Please read Part 2

SpaceX Changes Design Of Mars-bound Starship - Part 3 of 3 Parts

SpaceX Starship launch.jpg

Caption: 
Starship entering orbit

Part 3 of 3 Parts (Please read Parts 1 & 2 first)
       Engelund did say that methane might be a better coolant than water. However, he pointed out that when hydrocarbon fuels such as methane are exposed to very high temperatures, the carbon atoms can stick together and turn into a solid material. This would definitely block the tiny holes used in transpirational cooling. Any impurities in liquid fuels could also clog holes. A possible solution these problems might be to have many more holes than theoretically required.
       Once the Starship reached Mars and landed, the find sand and dust on Mars could clog the cooling holes. Engelund said, “Inspection and certification, in general, would be a thing of a concern for a large-scale active system like that — particularly at Mars, where you don't have access to a big gantry or towers to climb up and inspect. I suppose you could use drones. Maybe that's something he's thinking about.”
      Musk usually provides full details of his designs for spacecraft, but he has not yet done so for the Starship. He promised that he would provide such details for the Starship following a successful test of a prototype system being built at SpaceX facilities in Texas. It is not clear exactly how much testing SpaceX has actually done on his transpirational-cooling design concept. If the concept does not prove itself in tests, Musk has shown that he is able to adapt innovative designs that have failed in the past. A SpaceX representative said in an email that “We are using the same rapid iteration in design approach that led to the success on the Falcon 1, Falcon 9, Falcon Heavy, and Dragon programs.”
      Engelund is skeptical that Musk will be able to successfully construct, launch and land such a big and innovative spacecraft as the Starship. He told an interviewer that "Large-scale entry, descent, and landing is something that NASA has been challenged by for decades. We've spent a lot of time and given a lot of thought to how we might do it at Mars. We've landed the metric-ton Curiosity rover — that's the biggest thing we've ever put down on the surface of Mars." He said that the jump from landing a car sized robot on Mars to landing a skyscraper sized spacecraft filled with human beings may not be possible in the near future as Musk envisions. Such a landing is “a couple orders of magnitude" — roughly 100 times — more difficult than the Curiosity landing, which is arguably one of the hardest things we've ever done at NASA. It won't be easy for us or SpaceX.”
       SpaceX has challenged any comparison between landing NASA Curiosity rover and their Starship. A SpaceX representative said, “Curiosity was pushing the limits of 1970's Mars [entry, descent, and landing] technology including a specific parachute-based EDL. We are taking an entirely different approach, leveraging what we have done with Falcon 9, and have ample opportunity to demonstrate it on Earth prior to flying to Mars.”
       As creative as the new SpaceX designs for their Starship are, no space technology expert has said that the designs violate any engineering principles. However, as the old saying goes, “In theory. there is no difference between theory and practice, in practice, there is.”