Experts still aren't sure how the sixth military branch would actually work.
Here's how it all began.
A newly-investigated essay from 1939 reveals Churchill's thoughts on E.T.
NASA was founded on the principle that "activities in space should be devoted to peaceful purposes for the benefit of all mankind"
He made history (again) by going to space at age 77
Shooting for the stars.
Q&A with Amy Shira Teitel on 'Breaking the Chains of Gravity'
In our galaxy, but still far, far away
How much are we really paying to explore the universe?
Maybe, but they're still a bad idea
Rapid manufacturing methods may eliminate dependence on Russian rockets
PBS explains the physics of space skirmishes