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.

The levels of a heavy form of hydrogen in 3I/ATLAS are 30 to 40 times higher than in Earth's oceans, suggesting the comet has ...

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

Astronomers may have found an exciting new clue about dark energy—the mysterious force driving the universe’s accelerating expansion. They discovered an extraordinarily bright supernova from more than ...