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In terms of physical extent, the Andromeda Galaxy's disk diameter is well-measured, and spans 220,000 light-years across. For comparison, the diameter of the Milky Way's disk has long been thought to be only about half that: around 100,000 light-years.

therealkvr4
Both the Milky Way and The Andromeda galaxies lay claim to about a dozen satellite galaxies . Both are some 100 ,00 light - years across , containing enough mass to make billions of stars .

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