Credits: NASA/JPL-Caltech/UCLA
At 2.5 million light-years away, the Andromeda galaxy is the closest spiral galaxy to our Milky Way; in fact, it will collide with ours billions of years from now. This WISE mosaic covers an area equivalent to more than 100 full Moons, or five degrees across on the sky. Blue highlights mature stars, while yellow and red show dust heated by massive newborn stars.
Read more about this image here: https://www.nasa.gov/mission_pages/WISE/multimedia/pia12832-c.html
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