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Two sibling worlds lighter than cotton candy shatter the record for planetary density

NASA's TESS has confirmed two Jupiter-sized planets with densities lower than cotton candy — the puffiest worlds ever found. TOI-791 b and TOI-791 c orbit the same star, are gravitationally locked in resonance, and challenge what we know about how giant planets form.

Homer Dávila
By Homer Dávila
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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. Credit: NASA/Daniel Rutter.

NASA's TESS has confirmed two Jupiter-sized planets with densities lower than cotton candy — the puffiest worlds ever found. TOI-791 b and TOI-791 c orbit the same star, are gravitationally locked in resonance, and challenge what we know about how giant planets form.

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Homer Dávila
Homer Dávilahttps://skycr.org/homer-davila
Editor en SKYCR. Astrofísico. Dinámica solar, astronomía, radioastronomía, cosmología y ciencia planetaria. Miembro de la International Meteor Organization.
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