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Originally Posted by Cougar
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After their galactic collision, "Strong tidal forces from NGC 2207 have distorted the shape of IC 2163, flinging out stars and gas into long streamers stretching out a hundred thousand light-years..."
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Perhaps the dark matter also gets considerably thinned out - as ellipticals form from collisions of spirals.... (?) |
But that's not what the merger theories predict. They say that large dark matter halos are built up by the collisions.