M51, the Whirlpool Nebula, NGC5194/5195.

[M51] M51, the Whirlpool Nebula, NGC5194/5195.

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The Whirlpool Nebula in the constellation Canes Venatici was the first in which spiral structure was clearly seen. It is actually a pair of interacting galaxies. Kitt Peak 4-meter Mayall telescope, 1975.

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