Their first tracker is now in orbit. They plan to use a series of these to generate live maps of satellites big and small, fragments from old vessels, and debris as small as 5 cm.

A National Geographic photograph captures donkeys casting zebra-like shadows, creating a stunning optical illusion. The ...

The 700–1,300 feet-wide space rock deformed rocks more than six miles from the impact site when it hit 600 million years ago.