It's well established that the universe is expanding, but there's serious disagreement among scientists over how fast it's ...

A physicist proposes that the universe is not empty space, but is a viscous fluid, fueling the expansion and contraction we see.

A new theory suggests the universe’s greatest secrets are hiding in a “zeptouniverse” that’s ready to be explored—without ...

If true, the idea would blow past one of physics’ most sacred limits: that parallel versions of reality can never talk to ...

The discovery is just the latest to come from the asteroid sample, which dates back to the dawn of the solar system.