Slashdot: Astronomers Detected Signs of Our Milky Way Colliding With Another Galaxy

Astronomers Detected Signs of Our Milky Way Colliding With Another Galaxy
Published on June 15, 2019 at 12:30PM
fahrbot-bot shares a report from ScienceAlert: Antlia 2, the "ghost of a galaxy" orbiting the Milky Way, is a dark horse in more ways than one. Not only is it so faint it was only just discovered last year, it may now be responsible for curious ripples in the hydrogen gas that makes up the Milky Way's outer disc. According to new research, Antlia 2's current position is consistent with a collision with the Milky Way hundreds of millions of years ago that could have produced the perturbations we see today. The paper has been submitted for publication and is undergoing peer review. Antlia 2 was a bit of a surprise when it showed up in the second Gaia mission data release last year. It's really close to the Milky Way -- one of our satellite galaxies -- and absolutely enormous, about the size of the Large Magellanic Cloud. Further reading: CNET

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