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Circles
Astronomy Picture of the Day: A Plurality of Singularities at the Galactic Center
A recent informal poll found that astronomers don't yet have a good collective noun for a group of black holes, but they need one.
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Astronomy Picture of the Day: Moon Halo over Stone Circle
Have you ever seen a halo around the Moon?
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Astronomy Picture of the Day: Galaxy Formation in a Magnetic Universe
How did we get here?
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Photographing the Night Sky: Star Trails
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