Stem cells sent to the ISS return with signs of accelerated aging, revealing key risks for future space travel.

For more than a century, physicists have suspected that the familiar three dimensions of space and one of time might be only ...

It’s been more than half a century since humans last walked on the Moon, but we’re on the verge of doing so again.

Far beyond Neptune, at the far outer rim of our Solar System, astronomers have spotted what looks like a hidden “structure” ...

Albert Einstein’s general theory of relativity does a great job at explaining gravity but it is thought to be incomplete ...