The gravitational lens effect was predicted by A. Einstein | Startups & Ventures

The gravitational lens effect was predicted by A. Einstein

Back in 1915, as part of the general theory of relativity, he first correctly calculated the angle of deflection of a beam of light in the gravitational field.

By the end of the 20th century several dozens of gravitational lenses were discovered. Some images are indeed in the form of an even or broken ring, which is called the "Einstein ring" or the "Chwolson-Einstein ring".
- @Technology -