The Largest Black Holes in the Universe Formed in a Snap — Then Stopped

By Brandon Specktor About 13 billion years ago, when our universe was still just a scrappy startup, the cosmos hit a creative streak and churned out supermassive black holes left, right and center. Astronomers can still sneak a peek at these relics of the early universe when they look at quasars, incredibly large, outstandingly bright objects …