What Are The Best Reasons Why We Should We Explore Space?

It's difficult to look up on a clear night and not feel the pull to get out there, anywhere, and see a little more of the universe than the little blue marble that we've anchored ourselves on. But, when faced with the need to justify the money, time, and tech to get us there, what are the best reasons to explore space? » 9/29/14 4:20pm 9/29/14 4:20pm