X-37B started executing a series of aerobraking maneuvers to change from a highly elliptical orbit to a lower orbit.

More objects are being launched into space than ever, and most are headed for low Earth orbit. This region of space has become increasingly crowded with launches from SpaceX and others that have ...

NASA's technology-demonstrating Advanced Composite Solar Sail System (ACS3) has a bent boom in Earth orbit, a newly released ... fully extended to its square shape roughly half the size of a ...