Whirlpool Galaxy
M51, the Whirlpool Galaxy, is a pair of galaxies locked in a gravitational embrace. In 2011, for the second time in six years, a massive star exploded as a supernova, seen as a bright star in the spiral's lower right arm.
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Photo credit: © R Jay GaBany / Stocktrek Images / Alamy / Afripics
License: Royalty Free
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