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The star-mapping satellite Gaia has found more than 20 stars speeding across the Milky Way toward intergalactic space. There are just a few things that can slingshot a star out of a galaxy and all of them take some extreme gravitational interactions.
Host: Caitlin Hofmeister
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Sources:
https://www.knowablemagazine.org/article/physical-world/2018/unbound-and-out-boosted-black-holes-stars-speed-leaving-clues-behind.
https://arxiv.org/pdf/1805.04184.pdf
https://arxiv.org/pdf/1308.3495.pdf
https://arxiv.org/pdf/1810.02029.pdf
https://academic.oup.com/mnras/article/469/2/2151/3573852
https://www.annualreviews.org/doi/10.1146/annurev-astro-082214-122230
http://www.spitzer.caltech.edu/images/1925-ssc2008-10b-A-Roadmap-to-the-Milky-Way-Annotated-
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Images:
http://www.esa.int/ESA_Multimedia/Images/2013/08/Artist_s_impression_of_Gaia2
https://www.esa.int/Science_Exploration/Space_Science/Gaia/Gaia_spots_stars_flying_between_galaxies
https://commons.wikimedia.org/wiki/File:X-RayFlare-BlackHole-MilkyWay-20140105.jpg
https://www.nasa.gov/multimedia/imagegallery/image_feature_649.html
https://www.eso.org/public/videos/eso1311b/
https://www.spacetelescope.org/images/heic1509c/
https://www.spacetelescope.org/images/opo1019b/
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