Oxygen has been the most important gas in our search for life among the cosmos thus far. On Earth, we have it in abundance ...

Debunking alien claims matters, but so does telling richer, more compelling stories about how humans shaped their own past.

Breaking space news, the latest updates on rocket launches, skywatching events and more! You are now subscribed Your ...

Could ancient humans really have built the pyramids without extraterrestrial help? Or do such questions reveal more about modern anxieties than the past itself?

Debate has raged for two decades over whether Pluto should be considered a planet. Some want President Trump to take action ...

Big changes are in progress abroad and at home.