In May-June 2020, Comet C/2019 Y4 (ATLAS) passed through the field of view of the NASA/STEREO HI-1 camera. In addition to the comet, we see Mercury sporting a sodium tail, and lots of outflow from the Sun, all back-dropped by a beautiful starfield.
Credits: NASA/STEREO, NRL/SECCHI, Karl Battams
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