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Astronomy Picture of the Day

Discover the cosmos!Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2005 March 4
See Explanation.  Clicking on the picture will download the highest resolution version available.

NGC 1427A: Galaxy in Motion
Credit:Hubble Heritage Team(AURA /STScI),ESA,NASA

Explanation:In thistantalizingimage, youngblue star clustersandpink star-forming regions abound inNGC 1427A, a galaxy in motion.The smallirregular galaxy'sswept back outline points toward the top of this picturefrom the Hubble Space Telescope -and that is indeed the direction NGC 1427A is moving asit travels toward the center of theFornaxcluster of galaxies, some 62 million light-years away.Over 20,000 light-years long and similar to thenearby Large Magellanic Cloud,NGC1427A is speeding through theFornax cluster'sintergalactic gas at around600 kilometers per second.The resulting pressure is giving the galaxy itsarrowhead outline and triggering the beautiful butviolent episodes of star formation.Still, it is understood thatinteractions with cluster gas and the othercluster galaxiesduring its headlong flight will ultimatelydisruptgalaxy NGC 1427A.Many unrelated background galaxies are visible inthe sharp Hubble image, including a strikingface-onspiral galaxy at the upper left.

Tomorrow's picture:Tycho and Copernicus


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Authors & editors:Robert Nemiroff(MTU) &Jerry Bonnell(USRA)
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&Michigan Tech. U.


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