Thousands of pieces of space debris, also known as space junk, are orbiting Earth, with tons more added each year. This orbital debris poses a significant threat to satellites, spacecraft ...

A Russian satellite in low Earth orbit broke up June 26, creating more than 100 pieces of trackable debris and briefly causing the ISS crew to take shelter.

These tutorials cover everything you need to know about how to build a rocket, how to launch them, how to put them in orbit, and how to descend back down.

The United States military is preparing to launch its secretive X-37B space plane on a seventh mission in orbit.

Earth’s orbit around the Sun is not circular, but an ellipse. The perimeter of Earth’s orbit is roughly 584 million miles (940 million km).

Small "backpacks" that can attach to existing spacecraft in orbit may help out-of-fuel satellites live a while longer.

Millions of human-made objects travel at high speeds in low-Earth orbit, polluting space and increasing the chance of collision with satellites and other spacecraft ...