Our Milky Way Will Crash Into a Neighbor Galaxy Sooner Than You Think

Space.com | 1/4/2019 | Staff
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Our Milky Way galaxy will endure more than one dramatic collision in the foreseeable future, new research suggests.

You may be aware that the huge and beautiful spiral galaxy Andromeda will plow into the Milky Way about 5 billion years from now, livening up the night skies of any Earth creatures who are still around to look up. But one of our smaller galactic neighbors, the Large Magellanic Cloud (LMC), will actually hit the Milky Way about 2.5 billion years before the epic Andromeda event, according to a new study.

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"The destruction of the Large Magellanic Cloud, as it is devoured by the Milky Way, will wreak havoc with our galaxy, waking up the black hole that lives at its center and turning our galaxy into an active galactic nucleus or quasar," lead author Marius Cautun, a postdoctoral fellow at the Institute for Computational Cosmology at Durham University in England, said in a statement. (That central supermassive black hole, known as Sagittarius A*, is about 4 million times more massive than the sun.)

"This phenomenon will generate powerful jets of high-energy radiation emanating from just outside the black hole," Cautun added.

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But rest easy: These jets won't affect our solar system, he stressed. And while gravitational interactions spurred by the merger could fling us out into intergalactic space, the chances of this happening are slim, Cautun added. The distances between stars are so vast that even a galactic smashup probably won't jostle our solar system.

The LMC is a satellite of the Milky Way that lies about 163,000 light-years from our home spiral. Astronomers hadn't previously pegged the smaller galaxy as a compelling collision candidate, thinking instead that the fast-moving LMC would...
(Excerpt) Read more at: Space.com
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