The unique system could teach us about how planets are born.
Cracks on the dwarf planet’s icy surface suggest it was warm enough to host a liquid ocean early in its...
For almost a century, astrophysicists have struggled with the question. They’re still at it—and have some pretty wild ideas.
But we're not quite ready to trash general relativity.
Doesn't seem too fair.
We have no idea what it might be.
Wednesday was a big morning for astronomers.
A simple answer you can explain to your friends.
A real breath of fresh air.
Like science, tech, and DIY projects?
Sign up to receive Popular Science's emails and get the highlights.