what is the mass of a galaxy??
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Though astronomers don't use kilograms when measuring such large objects as the Sun or galaxies, the Milky Way and its halo would be about 6 x 10^42 kilograms.
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At the low end of the estimate range, the mass of the Milky Way is 5.8×1011solar masses ,somewhat less than that of the Andromeda Galaxy.
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