Purple Haze, Part Deux
A massive cluster of galaxies located about 2.3 billion light years away, Abell 1689, shows signs of merging activity. Hundred-million-degree gas detected by NASA's Chandra X-ray Observatory is shown as purple in this image, while galaxies from optical data from the Hubble Space Telescope are colored yellow.
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https://www.nasa.gov/image-detail/purple-haze-part-deux/
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