Which small collection of galaxies, including the Milky Way and Andromeda, is gravitationally bound to collide?
Answer
The Local Group
The Local Group is the specific small collection of galaxies that contains both our home galaxy, the Milky Way, and the Andromeda galaxy. The text states that the gravitational attraction between the members of the Local Group is so significant due to their combined mass that they are not merely drifting apart due to cosmic expansion, but are actually destined to collide with one another in the future. This localized gravitational binding illustrates the principle of local mass dominance overcoming general expansion on smaller structural scales.
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What Force Binds A Galaxy Together? - Physics Frontier - YouTube
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