Galaxies generally move away from one another.
Most galaxies generally move away from each other due to the expansion of the universe, a phenomenon observed through the redshift of light from distant galaxies. This movement is described by Hubble's Law, which states that the recessional velocity of a galaxy is proportional to its distance from us. However, within galaxy clusters, gravitational interactions can cause galaxies to move closer together, and some may even collide or merge. Overall, the large-scale motion of galaxies is predominantly influenced by the expansion of space itself.
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By virtue of their name, dwarf galaxies are smaller. Most galaxies are dwarf galaxies.
Elliptical galaxies are large blob shaped galaxies that most galaxies will eventually look like. Elliptical galaxies are what happens when two or more large galaxies collide and coalesce.
The Big Bang theory is currently the most widely accepted explanation for the formation and expansion of the universe. It proposes that the universe began as a singularity and has been expanding ever since, with galaxies moving away from each other. This theory is supported by observational evidence, such as the cosmic microwave background radiation and the redshift of distant galaxies.
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