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ELI5: Are all the stars we see in our night sky part of milky way, or some belong to other galaxies too? Also, how do we know if a star is from other galaxy?
ELI5: Are all the stars we see in our night sky part of milky way, or some belong to other galaxies too? Also, how do we know if a star is from other galaxy? * /r/explainlikeimfive
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