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Last updated on April 18, 2014 at 1:21 EDT
M51 the Whirlpool Nebula NGC51945195
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M51, the Whirlpool Nebula, NGC5194/5195

January 26, 2005
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.