Friday, December 4, 2009

APOD 2.4

Polar Ring Galaxy NGC 660
http://apod.nasa.gov/apod/ap091203.html

This is a picture of NGC 660, a polar ring galaxy in the constellation Pisces. In a polar ring galaxy, stars, gas, and dust orbit in a ring around a central disk. This type of galaxy may result from a collision of two galaxies, or from the capture of matter from another galaxy. NGC 660 is 20 million light years away and its ring is 40,000 light years across. NGC 660 is one of only a few known polar ring galaxies, and its central disk consists of a super massive star cluster.

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