SMRTR Science & EngineeringJun 18, 2026Scientific American

Salty clouds discovered on pink puffball planet

SMRTR summary

Using the James Webb Space Telescope, astronomers discovered salty clouds in the atmosphere of GJ504b, a mysterious pink, Jupiter-like object located 57 light-years away. The object, which glows a dark cherry-blossom pink and sits at a relatively cool 550°F, may be a giant planet or a brown dwarf star. Scientists found the clouds likely contain chloride and sulfide salts, helping explain unusual temperature patterns in its atmosphere.

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