NASAのインスタグラム(nasa) - 4月10日 04時33分

Graceful arcs in the center of this galaxy-packed Hubble Space Telescope (@NASAHubble) image are an example of a cosmic phenomenon known as an Einstein ring. Created as the light from distant objects, like galaxies, pass by an extremely large mass, like the galaxy cluster seen here.
This galaxy cluster - a monstrous collection of hundreds of galaxies all shackled together in the unyielding grip of gravity has a mass large enough to severely distort the space-time around it, creating the odd, looping curves that almost encircle the center of the cluster. In this image, the light from a background galaxy is diverted and distorted around the massive intervening cluster and forced to travel along many different light paths toward Earth, making it seem as though the galaxy is in several places at once.

Credit: ESA/Hubble & NASA; Acknowledgment: Judy Schmidt

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