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Posted by Russell A. Hopkins on March 21, 2002 05:06:30 UTC

How much mass is in the sun? How much in billions of suns? How fast are the Milky Way and M31 moving towards each other. Is there any source of power in existence (never mind how to access it) that can stop that kind of momentum? If so, why has not some older civilization in either M31 or the Milky Way already done so?

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