Explore these orbiting pioneers ... above the Earth. The repair worked, and Hubble began to deliver crystal-clear images. Hubble's images have helped to pin down the age of the universe, which ...

The closest of the asteroids to us—estimated to be about the size of a car—is whizzing through space at 27,358 miles per hour.

NASA and Roscosmos have been trying to pin down the cause of continued cracks ... the ISS is traveling at 17,500 mph around the Earth. Orbiting debris is traveling just as quickly.