A galaxy is positioned precisely behind another,very massive,galaxy on the sky.We would observe the more distant galaxy as a:

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This phenomenon is known as gravitational lensing, where the massive foreground galaxy acts as a lens, bending the light from the more distant galaxy into a ring shape, known as an Einstein ring. This occurs when the two galaxies are perfectly aligned with the observer, causing the light from the more distant galaxy to be bent around the closer one, creating a ring-like appearance.

A Galaxy Is Positioned Precisely Behind Another,very Massive,galaxy on the Sky.We