English: Yellow arrows represent the positions and motions of stars originating from Gaia-Enceladus in a simulation of a galactic merger with the Milky Way with characteristics similar to those implied by Gaia data.
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Uploaded a work by Koppelman, Villalobos and Helmi (simulation) from http://www.esa.int/Science_Exploration/Space_Science/Gaia/Galactic_ghosts_Gaia_uncovers_major_event_in_the_formation_of_the_Milky_Way with UploadWizard