Einstein ring

An Einstein Ring is a phenomenon in astrophysics that occurs when a massive object, like a galaxy or cluster of galaxies, lies directly between us and a more distant object, such as another galaxy. The gravity of the foreground object bends the light from the background object, creating a ring-like appearance. This effect is a result of Einstein's theory of general relativity, which describes how mass can warp space and time. When conditions are just right, we see a complete or partial ring, revealing the hidden structure of distant galaxies and helping scientists study the universe's composition and expansion.