A galaxy made almost entirely of dark matter, an elusive form of matter that doesn’t interact with light, was spotted by Hubble 250 million light-years from Earth.

A team of scientists says it's possible to use tiny ripples in space and time, or gravitational waves, to measure the rate at ...

Last year, our most detailed map of the universe yet suggested our understanding of dark energy has been wrong for decades. The shock result is reigniting the search for a better cosmic story ...

Physicists are scrambling to understand why dark energy is weakening. In a surprising twist, we must now reconsider the ...

We all know we live in three-dimensional space. But what does it mean when people talk about four dimensions? Is it just a ...