Throughout the more than a century of observation through telescopes and the visits of orbiters and landers, Mars has fascinated the human race. Much smaller than the Earth, the surface area is about equivalent to the land area on Earth.
Once you go to the trouble of launching a spacecraft, you may be faced with the problem of landing it safely back on Earth or some other astronomical body with an atmosphere.
One of the big problems for the future of spaceflight is the growing amount of junk in Earth Orbit. The human race is certainly careless about littering space.