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M31, the Andromeda Galaxy, is the closest galaxy like our own
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Now, NASA's Fermi mission reports a strange gamma-ray signal at its center
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This could be a signal of mysterious dark matter
Or the collective glow of many spinning neutron stars, called pulsars
Astronomers don't yet know
Fermi has found a similar unexplained signal at the center of our own galaxy
By exploring M31, Fermi may be able to tell us what's going on much closer to home
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