When a thunderstorm recently lit up the night sky, cameras captured towering red shapes that looked uncannily like glowing jellyfish hanging above the clouds. The images raced across social media, and ...

"What inspired us most was the long-standing mystery of how the young sun's violent activity influenced the nascent Earth." When you purchase through links on our site, we may earn an affiliate ...

A team of astronomers claims to have sniffed out a “biosignature” in the atmosphere of a distant planet called K2-18b. But not everyone agrees that it signals life. An illustration shows what ...

You’ve traveled thousands of light-years through interstellar star systems. And now you’re stranded on a planet you know nothing about. As long as you’ve got oxygen, water and food aboard your ...