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Wouldn't dark matter provide an alternate explanation for "filament" structure in the universe? The results of the Millenium Simulation seem to fit his qualitative description, and it was run with 10 billion particles, so it's definitely got enough resolution. http://www.mpa-garching.mpg.de/galform/virgo/millennium/

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I think the point is that negative mass might be an explanation for dark matter and/or dark energy. Scientists don't really have any explanation for what either of those are -- they're really just "fudge factors" to make the theories fit our observations. To fully understand things, we need to figure out why we need the fudge factors.

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