TAG | Dark matter and ordinary matter separate as two massive galaxies collide |
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| by William Atkins | |
| Friday, 29 August 2008 | |
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Page 3 of 3 The news release also states, “The separation between material shown in pink and blue therefore provides observational evidence for dark matter and supports the view that dark matter particles interact with each other only very weakly or not at all, apart from the pull of gravity.” And, “Under the assumption that the subclusters experienced a head-on collision in the plane of the sky, we obtain an order-of-magnitude estimate of the dark matter self-interaction cross-section …, re-affirming the results from the Bullet Cluster on the collisionless nature of dark matter.”
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