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.
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Jupiter-sized planets are as fluffy as cotton candy, and NASA isn’t sure why

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NASA’s TESS mission found two super-puff planets orbiting TOI-791, offering clues about how giant planets form and evolve over time.

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