Einstein's effect causes supernova to appear multiple times.

An international team of astronomers led by Ariel Goobar of the Oskar Klein Centre at Stockholm University discovered an unusual Type Ia supernova, SN Zwicky (SN 2022qmx), and observed it four times thanks to a gravitational lens. The team observed an “Einstein Cross,” a phenomenon predicted by Einstein’s Theory of General Relativity where the presence of a gravitational lens in the foreground amplifies light from a distant object. The discovery of SN Zwicky presents numerous opportunities for astronomers, including the ability to study it in greater detail and further investigate the mysteries of gravitational lenses.