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ESO on Twitter: "Around 9 billion years ago, a galaxy collided with the #MilkyWay, which it is believed to be the origin of the Milky Way's two discs. Learn more about our
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![ESO on Twitter: "Around 9 billion years ago, a galaxy collided with the #MilkyWay, which it is believed to be the origin of the Milky Way's two discs. Learn more about our ESO on Twitter: "Around 9 billion years ago, a galaxy collided with the #MilkyWay, which it is believed to be the origin of the Milky Way's two discs. Learn more about our](https://pbs.twimg.com/media/Fg-RlnTX0AIGm_N.jpg:large)