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Any pattern of stars in the night sky. Unlike constellations, whose boundaries are
preicsely defined, asterisms are entirely unregulated. Some, like the Plough (Big Dipper), or
the Square of Pegasus, are well-established formations despite their unofficial status.
Others are less well known, like Job's Coffin in Delphinus, or the
Milk Dipper in Sagittarius.
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