Panorama of the Whale Galaxy
http://antwrp.gsfc.nasa.gov/apod/ap100517.html
NGC 4631, also known as the Whale Galaxy, is a large spiral galaxy that is seen edge-on from our perspective. This pictures shows the high diameter-to-height ratio characteristic of spiral galaxies. It is similar to the Milky Way in size. The Whale Galaxy is seen in the direction of Canes Venatici and is about 30 million light years away. The blue stars are evidence of star formation; also notable in this picture are the dark streaks of instellar dust clouds.
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