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)
M51: The Whirlpool Galaxy in Dust and Stars Image Credit: N. Scoville (Caltech), T. Rector (U. Alaska, NOAO) et al., Hubble Heritage Team, NASA Explanation: The Whirlpool Galaxy is a classic spiral galaxy. At only 30 million light years distant and fully 60 thousand light years across, M51, also known as NGC 5194, is one of the brightest and most picturesque galaxies on the sky.