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Every galaxy has a supermassive black hole at its center, much like every egg has a yolk. But sometimes, hens lay eggs with two yolks. In a similar way, astrophysicists like us who study supermassive ...

The original version of this story appeared in Quanta Magazine. Galaxies have been merging into ever-bigger structures over the course of cosmic history. When galaxies merge, the supermassive black ...

While black holes are perplexing at any size, some of the most mysterious are hypothetical primordial black holes, those that sprung into existence in the first second after the Big Bang and some of ...

The giant holes in galaxies’ centers shouldn’t be able to merge, yet merge they do. Scientists suggest that an unusual form of dark matter may be the solution. Galaxies have been merging into ...

Black holes don’t have many identifying features. They come in one color (black) and one shape (spherical). When you purchase through links on our site, we may earn an affiliate commission. Here’s how ...