UFOs, or the notion of them, have been around a long time. Here’s a look at how the various iterations of the subject — from ...

Integrity arrived in lunar space early this morning. The capsule journeyed into the moon's "sphere of influence," the region where lunar gravity is stronger than that of Earth, at ...

For weeks, they’d been having furtive discussions about whether Sam Altman, OpenAI’s C.E.O., and Greg Brockman, his second-in ...

NASA astronaut Mike Fincke says he is the crew member who had a medical scare on board the International Space Station, leading to a rare medical evacuation in space in January. He was eating dinner ...