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Astronomers have confirmed the first discovery of an alien planet in our Milky Way that came from another galaxy, they announced today (Nov. 18).
The Jupiter-like planet orbits a star that was born in another galaxy and later captured by our own Milky Way sometime between 6 billion and 9 billion years ago, researchers said. A side effect of the galactic cannibalism brought a faraway planet within astronomers' reach for the first time ever.
Rethinking theories of planet formation
Most of the nearly 500 alien planets discovered so far orbit metal-rich stars, researchers said. And a metal-rich star is fundamental to the dominant theory explaining how giant planets form — the core-accretion model.
This model posits that dust and gas particles circling a young star cling together and gradually become larger, forming rocks, boulders and eventually the stony cores of giant, gassy planets like HIP 13044b.
Because its parent star is so metal-poor, HIP 13044b may have formed in a different way, researchers said. The planet may have arisen via the gravitational attraction between gas molecules, through a process termed the disk-instability model. So it may not have a rocky core at all.
Originally posted by Misoir
Just a question, could this be Nibiru?