The Local Group is the gravitationally bound galaxy group containing the Milky Way, M31, and their satellite galaxies.
The Local Group timing argument treats the Milky Way and M31 as a nearly radial two-body orbit whose present separation, approach speed, and cosmic age constrain their total mass.

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Local group by Ciro Santilli 40 Updated 2025-07-16
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The basically composed of only the Andromeda Galaxy and the Milky Way. Every other galaxy is a satellite of those two.
Figure 1. Source.
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