Which of the constellations is the largest?
Big Dog
Hydra
Orion
Great Bear
Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees. Also one of the longest at over 100 degrees, It has a long history, having been included among the 48 constellations listed by the 2nd century astronomer Ptolemy. It is commonly represented as a water snake. 
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Big Dog
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Great Bear
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