For now I think of manned space exploration as a vanity. It's so ludicrously expensive compared to robotic exploration that, in my mind, it's impossible to just

For now I think of manned space exploration as a vanity. It's so ludicrously expensive compared to robotic exploration that, in my mind, it's impossible to justify. It's just "cool." Eventually we'll need manned spaceflight to escape this rock, but we have more pressing concerns at the moment.