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C/2025 F2 (SWAN) is getting closer to the Sun and becoming brighter.
So far, the comet has not released much dust. In fact, it is shining a green color just like Comet Nishimura of 2023, which was dubbed the “green comet” for just how green it was. The emerald hue is ...
There's a bright new comet in the sky—and it's green
Currently only visible from the Northern Hemisphere, C/2025 F2 (SWAN) looks like a small green sphere. Its vivid green glow is caused by diatomic carbon molecules, which emit a green light under the ...