Dozens of stars fleeing a neighbor of the Milky Way suggest these escapees could have an outsized influence on their cosmic surroundings.
in a satellite galaxy of the Milky Way. The swarm of speeding stars could mean that such runaways had a bigger influence on cosmic evolution than previously thought, astronomers report October 9 inMassive stars are born in young clusters, packed so close together that they can jostle each other out of place.
The cluster “is an iconic object,” says astrophysicist Sally Oey of the University of Michigan in Ann Arbor, who was not involved in the new work. The view from Earth’s neighborhood is so clear, “we can really look at things up close and personal.” That means runaway stars could be an underappreciated force in the universe. These massive stars, about five to 140 times the mass of the sun, emit ultraviolet radiation and supersonic stellar winds that can“Before, we’d expect maybe there are a handful of runaways,” Stoop says. But because of their presumed low numbers, he says, they would be left out of studies and simulations.
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