Add Yahoo as a preferred source to see more of our stories on Google. Solutions to Einstein's famous equations back in the 20th century describe 'wormholes,' or tunnels through space-time. Mark ...

A curious question sparked a cosmic deep dive into why light never tires—even after 25 million years on the move. Reading time 4 minutes My telescope, set up for astrophotography in my light-polluted ...

On September 14, 2015, two enormous laser instruments in the United States twitched in near-perfect unison, registering a whisper of a signal that had traveled across the cosmos for more than a ...

What if our biggest idea about reality is built on a hidden misunderstanding? A new philosophical look at space-time challenges the popular view that the past, present, and future all exist together ...

For the first time, scientists have detected a cosmic hum — the faint vibration of gravitational waves filling the universe. These ripples in space-time reveal the hidden collisions of ancient black ...

Whether space-time exists should neither be controversial nor even conceptually challenging, given the definitions of “space-time,” “events” and “instants.” The idea that space-time exists is no more ...

Imagine two towns on two opposite sides of a mountain. People from these towns would probably have to travel all the way around the mountain to visit one another. But, if they wanted to get there ...