Today's Top Story : historical windows
May Friday 18, 2012 at 14:35
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Today's Picture

A mere 2.5 million light-years away, the Andromeda Galaxy really is just next door as large galaxies go. So close, and spanning some 260,000 light-years, it took 11 differentimage fields from the Galaxy Evolution Explorer (GALEX) satellite'stelescope to produce this gorgeous portrait of the spiral galaxy inultraviolet light.While its spiral arms stand out in visible light images of Andromeda(also known as M31), the arms look more like rings in theGALEX ultraviolet view , dominated by hot, young, massive stars.As sites of intense star formation, the rings have been interpreted asevidence Andromeda collided with its smaller neighboring ellipticalgalaxy M32 more than 200 million years ago.The large Andromeda galaxyand our own Milky Way are the dominant members of the localgalaxy group .


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