Astronomers spot the same supernova three times — and predict a fourth sighting in 16 years

Astronomers spot the same supernova 3x—and predict a 4th sighting in 16 years. An enormous amount of gravity from a cluster of distant galaxies causes space to curve so much that this "gravitational lensing" effect has astronomers to observe the same exploding star in three different places.

Rerun of Supernova Blast Expected to Appear in 2037

A supernova’s delayed reappearance could pin down how fast the universe expands