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Spanning approximately 220,000 light-years across, the Andromeda Galaxy is the largest galaxy of the Local Group, which also ...
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Space.com on MSNAstronomers discover dark matter 'bridge' linking colliding galaxies: 'This is the missing piece we've been looking for.'"All the odd shapes and swirling gas observed in the Perseus cluster now make sense within the context of a major merger." ...
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