United Launch Alliance announced its Vulcan rocket has been certified by U.S. Space Force to fly National Security Space Launch missions.

A rocket the Centennial company has worked on for years is cleared for liftoff on billions of dollars worth of military space ...

Observers across eastern North America and much of Europe will have front-row seats to the striking partial solar eclipse on March 29. Here's what to expect.

Lots of us look up at the night sky with wonderment, asking how humans are able to explore the universe. Tracy Drain, a ...