Why is the closing velocity of Andromeda and our galaxy so high?

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The closing velocity between Andromeda and our galaxy is approximately 100-140 km/s, which is relatively modest compared to other cosmic speeds, such as Earth's orbital speed around the Sun at 30 km/s and the Sun's speed around the galaxy at 220 km/s. This velocity may be influenced by the dynamics of the early universe, where galaxies were likely in a denser environment with more nearby galaxies and fragments. Additionally, the Triangulum Galaxy (M33), the third largest in the Local Group, approaches our galaxy at about 190 km/s. Understanding these velocities helps clarify the gravitational interactions within our local cosmic neighborhood. The discussion highlights the complex gravitational dynamics at play in galaxy interactions.
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Why is the closing velocity of Andromeda and our galaxy so high? 100-140 kms^-1 http://en.wikipedia.org/wiki/Andromeda_(astronomy)"
 
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zankaon said:
Why is the closing velocity of Andromeda and our galaxy so high? 100-140 kms^-1 http://en.wikipedia.org/wiki/Andromeda_(astronomy)"

This not a particularly large speed. For example, the orbital speed of the Earth with respect to the Sun is 30 km/s, and the Sun's orbital speed about the centre of our galaxy is 220 km/s.
 
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Perhaps in earlier universe, the small cluster environment was very different; perhaps with many more closer galaxies and what we might call fragments of galaxies. http://en.wikipedia.org/wiki/Hubble_Deep_Field_North"
 
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