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The Hubble Space Telescope

By: Samantha Johnson on Oct. 16, 2009, 11:21 p.m.
Galaxy M101

Photo: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)

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Galaxy M101

This spiral galaxy was discovered in 1781 and was the last object entered in the catalog of famous French astronomer, Charles Messier. It is classified as a ‘peculiar galaxy’ because although it appears spiral and symmetrical, it really is not. Its core is not centered and one arm has a very heavy concentration of hydrogen gas.