The United States military’s most enigmatic spacecraft is back in orbit, and this time officials are hinting more clearly at what it is doing up there. The eighth flight of the reusable X-37B space ...

China has launched a mysterious reusable space plane that has remained in orbit around Earth for more than 90 days. During its mission the spacecraft released an unknown object into space, raising new ...

We don't know for sure, but there are some intriguing clues. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Breaking space news, the latest ...