The giant-impact hypothesis posits that billions of years ago a Mars-sized body named Theia collided with the early Earth.

Butch Wilmore and Suni Williams recently told CNN they want to "change the rhetoric" about the two astronauts being "stuck in space." ...

But the mission will also bring something that’s never been installed on the moon or anywhere else in space before—a fully ...

"I weighed 363 pounds with all my equipment, but up on the Moon, just 60 pounds — so you could really spring up!” ...

Charlie Duke was honored during Admiral Farragut Academy's alumni weekend 72 years after graduating.