Add Yahoo as a preferred source to see more of our stories on Google. "That's the Pinwheel galaxy," I said. The name is derived from its shape – albeit this pinwheel contains about a trillion stars.

Time seems to be one of the most obvious things in the universe: it moves forward, seconds change minutes, and the past ...

The theory of special relativity is rife with counterintuitive and surprising effects, the most famous of which are length contraction and time dilation. If an object travels at a relative speed, ...

Here’s what you’ll learn when you read this story: In Albert Einstein’s Special Theory of Relativity, the concept of “time dilation” illustrates that the flow of time is dependent on the velocity and ...

Imagine a clock that doesn't have electricity, but its hands and gears spin on their own for all eternity. In a new study, physicists at the University of Colorado Boulder have used liquid crystals, ...

"Hearst Magazines and AOL may earn commission or revenue on some items through these links." To those of us living on Earth, time appears relatively immutable. Except for some clever bits of human ...