It's the first ever picture of the sun taken by NASA's Nuclear Spectroscopic Telescope Array (NuSTAR). The green and blue show x-ray emission (2-3 keV and 3-5 keV respectively), while the red shows colder ultraviolet emission. One interesting thing about this image is that the x-rays and the ultraviolet rays appear to be coming from slightly different places on the sun's surface, which suggests that there might be some cool physics going on there.

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