Europe’s Euclid space telescope has detected a rare halo of bright light around a nearby galaxy, astronomers reported Monday. The halo, known as an Einstein ring, encircles a galaxy 590 million ...

The structure is nearly 600 million light-years from Earth and is an early display of the nascent dark matter telescope's ...

Dark matter is a hypothetical form of matter believed to be everywhere, outnumbering regular matter (what we're made of) 5-to-1. It doesn’t emit or interact with light, so it is invisible to our ...