Multi-Star Systems Form When Gravity Gets Weird
Gravitational quirks can cause star-forming clouds to condense into pairs and groups of stars.By Evan Thomas | October 26, 2016
Multi-star systems are actually pretty common: We think nearly half of sun-type stars have a companion. Some have two or more. But how does a crowd of stars form all at once?
All stars start their formation the same way: Gravity pulls a whole lot of dust and gas into a ball. In a single-star system, the denser clump at the center eventually collapses and starts fusion. But if the system is going to end up with multiple stars, something else has to happen first.