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Astronomers Amazed by Perfect 'Einstein Ring' Gleaming in Space
(www.sciencealert.com)
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this post was submitted on 10 Feb 2025
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An Einstein ring, also known as an Einstein–Chwolson ring or Chwolson ring (named for Orest Chwolson), is created when light from a galaxy or star passes by a massive object en route to the Earth. Due to gravitational lensing, the light is diverted, making it seem to come from different places. If source, lens, and observer are all in perfect alignment (syzygy), the light appears as a ring.
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