Dark matter is more than five times as abundant as all the visible matter in the universe. So why can't we see any of it?

Some researchers have theorized that the "sterile neutrino"—a hypothetical, neutrally charged particle with no mass—could make up the "stuff" of dark matter. In 2014, physicists thought they'd ...

The Einstein ring, formed as light from a distant galaxy bends to glow around another object in the foreground, could help ...

Discover the extraordinary Einstein ring discovered by the Euclid space telescope. A perfect ring of light encircling galaxy ...

“The background galaxy in this lens is almost ... the researchers found that about 90% of the mass is stars, and about 10% dark matter (no word on the fraction in cats), which is pretty typical ...