Rubin Observatory identifies two faint Milky Way companions in early survey data
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Chile’s Vera C. Rubin Observatory on Cerro Pachón used pre-launch observations covering 7% of the night sky to find two previously unknown Milky Way satellites: an extremely faint galaxy about 355,000 light-years away and a star cluster hidden behind dust. Roughly 65 satellite galaxies are known; estimates suggest hundreds more remain undetected.
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