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From:
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ESA Science & Technology - Gaia hints at our Galaxy's turbulent life
https://sci.esa.int/web/gaia/-/60663-gaia-hints-at-our-galaxys-turbulent-life
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ESA's star mapping mission, Gaia, has shown our Milky Way galaxy is still enduring the effects of a near collision that set millions of stars moving like ripples on a pond.
