It is believed that matter, motion, gravity, and everything else we know of originated from the three dimensions of space and ...

Time, not space plus time, might be the single fundamental property in which all physical phenomena occur, according to a new ...

Benjamin Santer received enormous pushback when he authored one of the first reports on the scientific consensus of ...

Is the Hubble constant—a key part of how we measure the expansion of our universe—in a crisis? Some cosmologists say yes.

A common theme in science-fiction media, time travel is captivating. It’s defined by the late philosopher David Lewis in his essay “The Paradoxes of Time Travel” as “[involving] a ...

It’s not just in your head — time can actually flip. Physicists in New York have pulled off what sounds like a page ripped from a sci-fi script: They’ve confirmed that “time mirrors,” a ...