...can ‘see’ this once obscured background target. The lensed object then appears to an observer on Earth as a ring - a phenomena known as an Einstein ring. The SGL will work on a similar principle. As light from the distant world approaches our nearest...
... gravitational lens, distorting light from a distant galaxy behind it. This light can be bent into a ring – aptly called an Einstein ring – which allows astronomers to measure how light, and therefore spacetime is being distorted by the intervening...