The Day the Universe Rang Like a Bell
On September 14, 2015, LIGO detected a ripple in spacetime from two black holes colliding 1.3 billion years ago. The story of how we learned...
Journal
Journal
Your Head Is Older Than Your Feet — Here's the Proof
Image: EHT Collaboration / ESO Right now, at this very moment, the top of your head is aging faster than the soles of your feet....