Andromeda and our galaxy

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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)" [Broken]
 
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George Jones
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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)" [Broken]
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" [Broken]
 
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