What is the Local Group?
A) stars that occupy the same spiral arm as the Sun
B) poor cluster of about 50 galaxies of which the Milky Way is one
C) group of galaxies clustered around the Andromeda Galaxy M31, apparently gravitationally bound to it but separate from the Milky Way
D) group of about 100 stars within 20 ly of the Sun that appear to have been formed at about the same time from similar material
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