Rockhead wrote:Uhhh Dave, that still really doesn't work. How you gonna refuel it, and It don't launch itself back to space....
Another extinction event
( e.g., another asteroid impact )
might render the Earth inaccessible for the forseeable future ).
We need to establish
viable independent human communities
on the Moon, on Mars and in artificial satellites before the Earth gets hit again
or before a catastrophic eruption of a super volcano such as the one under Yellowstone Park.
David