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  • RESEARCH HIGHLIGHT

‘Super-puff’ planet is one of the fluffiest worlds ever found

An exoplanet named TOI-1420b has a volume more than 1,700 times that of Earth but a mass 25 times Earth’s.
Illustration of the Kepler-51 planetary system.

Super-puff planets (artist’s illustration) have densities lower than 0.2 gram per cubic centimetre. Credit: NASA, ESA, AND NRAO/SPL

Astronomers have discovered one of the most puffed-up planets yet1. Known as TOI-1420b, it has just 1.5% the density of Earth, making it one of the least-dense among the more than 5,000 extrasolar planets found so far.

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Nature 622, 673 (2023)

doi: https://doi.org/10.1038/d41586-023-03222-z

References

  1. Yoshida, S. et al. Astron. J. 166, 181 (2023).

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