Terry Virts, a retired US astronaut, has called for scaling back joint missions with Russia on the International Space ...

Technique shows how to dispose trash on the International Space Station. Credit: ESA / mash mix by Space.com's Steve Spaleta ...

The number of satellites orbiting Earth is rising fast, thanks to private companies such as SpaceX. But just how big will ...

The Red Planet and Earth align properly for interplanetary missions just once every 26 months. The next such opportunity ...