Extragalactic Expat: Newfound Exoplanet Likely Came from Another Galaxy: Scientific American

Extragalactic Expat: Newfound Exoplanet Likely Came from Another Galaxy: Scientific American: "Nearly everything we can see in the night sky without the aid of a telescope is in Earth's cosmic neighborhood, the Milky Way Galaxy. And the hundreds of planets that have been discovered outside our solar system all orbit stars within the Milky Way; their relative proximity permits the kind of careful look needed to identify an orbital companion.

Now a new study has located yet another extrasolar planet, or exoplanet, within our galaxy. But this one seems to have started out in another galaxy that was then consumed by, and incorporated into, the Milky Way several billion years ago."