I have blogged about U.S. and Indian space missions that have sent probes to Mars. Mars has fascinated the human race for centuries. First as a star representing a god in mythology and then as a planet close to the size and orbit of Earth. Mars is fourth planet from the Sun and the second smallest in the Solar System, only Mercury is smaller.
Titan is the largest moon of Saturn. It is also the only natural satellite of a planet in our solar system that has a dense atmosphere. It is also the only natural satellite where large stable bodies of liquid have been found on the surface. Titan is the second largest moon in the solar system. It is larger than the planet Mercury and fifty percent larger than the Earth's Moon.
It is estimated that there are about a half a million pieces of space junk orbiting the Earth. This junk includes " spent rocket stages, old satellites, and fragments from disintegration, erosion, and collisions." Space launches have to pass though this layer of junk. Some of the junk is orbiting in the same orbits of satellites and poses a threat of collision.