Einstein rings help scientists study dark matter and cosmic expansion. Euclid will find thousands more lenses to map the ...

"They're so rare, and they're incredibly useful scientifically," said Conor O'Riordan of the Max Planck Institute for ...

Gravitational lensing occurs when the gravity of a massive object, like a galaxy, warps the fabric of spacetime, bending the light from a more distant background object.

A rare ring of light surrounding a galaxy nearly 590 million light-years away from Earth has been discovered by a space ...