After more than 25 months of successful operations in space, the SpIRIT mission has ended, marking a major milestone for ...

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.

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 ...