The JWST has found evidence of auroras and clouds in the atmosphere of the giant rogue planet SIMP-0136, but the causes must be very different from anything we see within the Solar System. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

When SIMP-0136 was first discovered, it was classified as a brown dwarf and thought to be one of the closest to Earth at 21 light-years away. Subsequent evidence cast doubt on whether SIMP-0136 is fusing deuterium in its core, the defining feature of brown dwarfs, and some consider it to be a "rogue planet", ie one without an accompanying star.

There are probably a great many rogue planets closer to Earth than that, but without a star to light them up or be swayed by their gravity, they’re very har

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