Source: wikibot/einstein-cross
= Einstein Cross
{wiki=Einstein_Cross}
The Einstein Cross, also known as Q2237+030, is a fascinating astronomical phenomenon that exemplifies gravitational lensing. It consists of a distant quasar, which is a bright and active region around a supermassive black hole in a galaxy, and is positioned behind a foreground galaxy. The gravitational field of this foreground galaxy warps spacetime, causing the light from the quasar to be bent around it.