Astronomers think they’ve found 19 alien objects lurking in the solar system
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Our solar system seems to be hiding a small group of alien objects that began their lives around another star before moving to our cosmic neighborhood. New research suggests that 19 Centaurs — icy asteroids with occasional cometlike behavior that usually orbit between Jupiter and Neptune — did not originate in our solar system. Instead, the researchers propose the icy rocks were stripped, individually or en masse, from a nearby star when the Sun was just a newborn in a larger stellar nursery.
“Astronomers have known for a long time that there should be asteroids circling the Sun that were not formed in the solar system, but instead were captured early on during the formation of the planets,” Fathi Namouni, an astronomer at the Observatoire de la Côte d’Azur in France, tells Astronomy. “The difficulty was that we could not tell which are solar system-born and which are extrasolar-born.”