From the Herschel Space Observatory comes this infrared view of the closest galaxy to the Milky Way at only 2.5 million light-years away: the enormous and spiralling Andromeda Galaxy. This island galaxy stranded within the constellation of the Princess--known officially as M31--spans 200 000 light-years across--twice as large as our galaxy. The infrared spectrum reveals shining dust clouds and some areas of ocaque dust, with the red coming from radiating star heat of barely a few tens of degrees above zero and the blue from the hotter central core stars.
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