An experiment with a charged molecule of bismuth and carbon reveals how effects from Albert Einstein’s special relativity ...

Einstein’s general theory of relativity has been tested for the first time over distances nearly as large as the universe itself – and has, in the process, trumped most other alternative theories of ...

A best-yet measurement of one of general relativity’s most mind-boggling effects is “another feather in Einstein’s cap” ...

Some of the hardest questions in cosmology begin where the usual math gives up. Push Einstein’s theory far enough back toward the Big Bang, and the equations run into a singularity, a point where ...

A LONG TIME ago, in a galaxy far, far away—somewhere in the general direction of the constellation of Leo—two black holes ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. A bizarre "cosmic glitch" in the theory of how the gravity of the ...

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