Comets are objects that, when getting close to the Sun warm up and release gas. This gas can be seen as a coma and sometimes also as a tail or even double tail.
A very bright and recent comet was C/2020 F3 NEOWISE, which was visible to the unaided eye and showed a very nice double tail.
If you have any questions and/or remarks please let me know.
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C/2020 F3 NEOWISE C/2020 M3 Atlas