A supermassive black hole orbiting a bigger one revealed itself with a flash
The two supermassive black holes orbit each other every 12 years
![An illustration of a supermassive black hole orbiting an even larger black hole with a field of stars in the background.](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2023/06/061223_LG_black-hole_feat.jpg?fit=1030%2C580&ssl=1)
A supermassive black hole orbiting an even more supermassive black hole might explain the flashes of light coming from blazar OJ287 (illustrated).
JPL-Caltech/NASA