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The Milky Way Could Crash Into Another Galaxy Billions of Years Earlier Than Predicted
Mark your calendars for a rendezvous with the Large Magellanic Cloud.


https://www.theatlantic.com/
MARINA KOREN
JAN 5, 2019

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The Milky Way above a space observatory in ChileESO / S. BRUNIER


Ah, the Milky Way, our glittering home in the cosmos. Seen in an unencumbered night sky, far from the glare of city lights, it seems magnificent and eternal in its enormity. Nothing could shift this ancient web of stars, nothing could disturb its transcendent stoicism.

Except, that is, another galaxy. Galaxies orbit millions of light-years apart, but gravity, the immutable magnet of the cosmos, can pull them together, producing spectacular collisions that reshuffle stars. According to the leading theory, the Milky Way will collide with one of its closest neighbors, Andromeda, sometime between 6 billion and 8 billion years from now.

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« Reply #1 on: January 08, 2019, 09:58:44 PM »
But the Milky Way may face another galactic threat before that, from a different neighbor. A new study predicts our galaxy will collide with a galaxy called the Large Magellanic Cloud between 1 billion and 4 billion years from now.

This is a rather surprising change in schedule, considering that the Large Magellanic Cloud, which is close enough to be seen with the naked eye, is currently moving away from the Milky Way. What gives?


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« Reply #2 on: January 08, 2019, 09:59:32 PM »
Marius Cautun, an astrophysicist at Durham University’s Institute for Computational Cosmology, says that recent observations of the Large Magellanic Cloud have revealed that the galaxy has more mass than previously thought. Cautun and his fellow researchers decided to run computer simulations that took this new factor into account and fast-forwarded the conditions of our cosmic neighborhood. They tested multiple scenarios, making adjustments in mass, velocity, and other measures. In the end, the simulations predicted that in several hundred million years, the Large Magellanic Cloud will turn around and head straight for the center of the Milky Way.

“The collision between our galaxy and the [Large Magellanic Cloud] takes place in the majority of cases—over 93 percent,” Cautun says.

The collision would be a slow showdown, unfolding over the course of billions of years. Stars from the Large Magellanic Cloud would ricochet like pinballs, dislodging some of the Milky Way’s stars from their orbits. Our galaxy as a whole would survive, but some stars may be flung right out of the Milky Way, Cautun says.

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« Reply #3 on: January 08, 2019, 10:02:16 PM »
Meanwhile, the sleeping, supermassive black hole at the center of the Milky Way would wake up. Like volcanoes, black holes alternate between peaceful dormancy and ferocious activity, depending on the surrounding conditions. Ours is in a quiet period. But the chaos of the merger would send cosmic gas swirling toward it, and cosmic gas is dinner to black holes. The resulting feast is a spectacular show. A disk of luminous, hot cosmic material swirls around the black hole at great speed, and bursts of high-energy radiation erupt from its center. Cautun says one serving of a Large Magellanic Cloud could lead our black hole to gobble up enough material to grow 10 times its current size.

And what would happen to us, if there is any kind of “us”—life in some form—on Earth when this all goes down?

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« Reply #4 on: January 08, 2019, 10:02:43 PM »


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