I was watching a program the other day, and it mentioned some interesting things about exploring space. For example,
1. Nothing has been found on other planets that we need or would benefit from. Rather the opposite, we have found hostile environments that would kill us.
2. The cost to get a man to these places is astronomical, and not something that would reap benefit to our planet.
3. So far, nothing within reasonable traveling distance has shown itself worth an effort that would require man, and would not be done easier with machine.
So with this in mind, other then the travel we see with the Space Shuttle in our own orbit, that has shown some medical breakthroughs and so on. What really is the benefit to spending billions to get someone to Mars or beyond?