Among the tiny dots, spirals and ovals that make up the galaxies in the image, there are also sorp-shaped shapes,
Gravitational lensing occurs when the mass of an object causes light to bend. The curved crescents and snakes are light from galaxies outside Abell 2813.
The fact is that a cluster of galaxies has suchmass at which it acts like a gravitational lens: it bends light from more distant galaxies around itself. These distortions can manifest in many different forms.
This is clear evidence that mass causes light to bend.
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