The galaxy is around 23 million light years away, located within the constellation Canes Venatici. In this image, the Whirlpool is shown alongside Messier 51b, a dwarf galaxy with which it interacts.
On 31 May, a supernova was seen in M 51a. Observations by the Hubble Space Telescope suggested that it was the explosion of a yellow supergiant star 18 to 24 times the mass of our sun.
(Image: Karelteuwen )
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