This extraordinary image from the NASA/ESA Hubble Space Telescope of the galaxy cluster Abell 2813 (also known as ACO 2813) has an almost delicate beauty, which also illustrates the remarkable physics at work within it. The image spectacularly demonstrates the concept of gravitational lensing.
Among the tiny dots, spirals, and ovals that are the galaxies belonging to the cluster, there are several distinct crescent shapes. These curved arcs of light aren’t curved galaxies. They are strong examples of a phenomenon known as gravitational lensing.
Gravitational lensing occurs when an object’s mass causes light to bend. The curved crescents and “S” shapes are light from galaxies that lie beyond Abell 2813. The galaxy cluster has so much mass that it acts as a gravitational lens, bending light from more distant galaxies around it. These distortions can appear as many different shapes, such as long lines or arcs.
Citation: Hubble watches cosmic light bend (2021, April 18) retrieved 18 April 2021 from https://phys.org/news/2021-04-hubble-cosmic.html
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