National Aeronautics and Space Administration - NASA

This is the second astronaut mission for SpaceX.

Sunday’s launch follows by just a few months SpaceX’s two-pilot test flight.

Four astronauts — three Americans and one Japanese — are scheduled to rocket to the International Space Station on Sunday.

With Arizona still counting, McSally, a retired Air Force colonel, trails Kelly, a former NASA astronaut, by 81,000 votes.

For NASA, it marks the long-awaited start of regular crew rotations at the International Space Station.

The Space Force created a unit dedicated solely to orbital warfare -- and it includes the secret X-37B space plane.

A NASA astronaut will transfer into the U.S. Space Force later this month while onboard the International Space Station....

Astronauts from 19 countries have floated through the space station hatches, including many repeat visitors.

IMAX documentary "Asteroid Hunters" uses spectacular effects to show what an asteroid strike would do to earth and how we're...

The two veterans may have a lot in common, but in a tight Senate race, they've been openly clashing with one another.