Enlightened: Dark matter spotted after cosmic crash | Science News

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Enlightened: Dark matter spotted after cosmic crash

8:55am, August 23, 2006

An intergalactic collision is providing astronomers with a giant payoff: the first direct evidence of the invisible material that theorists say holds galaxies together and accounts for most of the universe's mass.

For some 70 years, cosmologists have agreed that theories of gravity account for observations in Earth's solar system but fail on a larger scale. For example, if those theories held throughout the universe, objects on the outskirts of the Milky Way would rotate more slowly tha

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