NASA’s TESS Mission Reveals the “Puffiest” Planets Ever Found
NASA has revealed two new “super-puff” planets, giant worlds so light that their density is comparable to cotton candy. Scientists calculate that these Jupiter-sized planets are the “puffiest” worlds ever found.
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3 min readNASA’s TESS Mission Reveals the “Puffiest” Planets Ever FoundArezu SarvestaniJun 24, 2026 Article This illustration depicts the Sun-like star TOI-791 and two giant planets that NASA's TESS space telescope discovered in its orbit. These planets, designated TOI-791 b and TOI-791 c, are roughly the size of Jupiter but a tiny fraction of its mass, meaning they have an extraordinarily low density. NASA / Daniel Rutter Data from NASA’s TESS (Transiting Exoplanet Survey Satellite) mission has revealed two new “super-puff” planets, giant worlds so light that their density is comparable to cotton candy. Scientists calculate that these Jupiter-sized planets—named TOI-791 b and TOI-791 c—are the “puffiest” worlds ever found.
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