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Looks like the Milky Way filched from one of its neighbors in the ancient past.
Our home galaxy stole several dwarf galaxies that used to belong to the Large Magellanic Cloud (LMC), a galaxy near the Milky Way. And it all happened because of an ongoing merger between these galaxies, which is a common process in our universe.
Discovery - Theft - Courtesy - Data - Gaia
The discovery of the theft came courtesy of new data from the Gaia space telescope, an ongoing European mission that will precisely measure the movements of a billion stars all told. Those observations include data about the current movements of several nearby galaxies.
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Team - Researchers - Information - Simulations - Movements
So a team of researchers compared that information with simulations that played out these movements over long periods. The comparison suggested that four ultrafaint dwarfs and two other dwarf galaxies (known as Carina and Fornax) used to be part of the LMC. But the Milky Way, a larger galaxy, managed to tear the LMC apart...
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