The Whirlpool Galaxy (M51A or NGC 5194) and M51B or NGC 5195. Photo Credit: R. Jay GaBany http://en.wikipedia.org/wiki/Whirlpool_Galaxy AND http://en.wikipedia.org/wiki/Whirlpool_Galaxy#mediaviewer/File:Messier51_sRGB.jpg
A composite image of M51, called the Whirlpool Galaxy, 30 million light years from Earth and 60 thousand light years across. The original images were taken with a telescope at Kitt Peak National Observatory, and the Hubble Space Telescope. (Photo: NASA via The Telegraph)
Amazing New X-Ray Image of the Whirlpool Galaxy Shows it is Dotted with Black Holes
NGC 5194 - Whirlpool Galaxy (M51) is an interacting grand-design spiral galaxy with a Seyfert 2 active galactic nucleus in the constellation Canes Venatici. It was the first galaxy to be classified as a spiral galaxy.