Space is the final frontier, right? That's what science fiction loves to say, and there's a lot of whimsy and wonder behind such a statement. But that's for a fairly good reason. After all, it's not a ...

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 ...

Our cosmos seems, at times, like one impossibly vast factory, just pumping out mysteries. The deeper we peer, the more we learn – but each new discovery stirs up a plethora of new puzzles to solve, ...

Liftoff of the "Commercial GTO-1" mission occurred at 1:04 a.m. EDT on Sunday morning (July 13). When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.