Astronomers have discovered a pair of giant super-puff planets that are lighter than cotton candy, orbiting a star in the southern constellation Volans. The findings, reported on July 5, 2026, reveal these planets are the largest exoplanets known to possess less density than cotton candy, according to George Dransfield from the University of Oxford.
Located 1,110 light-years away, these planets are compared to a "nice blob of shaving foam, fresh from the can," as stated by Dransfield in an email. The research results were published in the Monthly Notices of the Royal Astronomical Society.
Characteristics of the Newly Discovered Super-Puff Planets
The newly identified super-puff planets are remarkable not only for their size but also for their extraordinary lightness. With densities significantly lower than those of Jupiter, which is approximately 35 times denser, these planets challenge existing notions of planetary formation and structure.
Researchers suspect that these fluffy worlds are primarily composed of hydrogen and helium. However, further analysis using NASA's Webb Space Telescope is needed to confirm their chemical composition. Dransfield noted, "These two planets have densities comparable to a nice blob of shaving foam, fresh from the can."
Formation and Rarity of Super-Puff Planets
Super-puff planets are considered a rarity in the cosmos, with fewer than 40 identified among nearly 6,300 confirmed exoplanets. They are believed to form around protoplanetary disks rich in gas, where the gas density exceeds that of dust.
Over time, these planets lose much of their material, leading to their current fluffy state. Dransfield remarked, "Ultimately, by studying exotic systems containing rare planet types, we add further pieces to the puzzle of planet formation and learn more about our place in the cosmos."
The Role of NASA's TESS Satellite in Discovering Exoplanets
The discovery of these super-puff planets was made possible by NASA's TESS (Transiting Exoplanet Survey Satellite) over the past decade. TESS has been instrumental in identifying numerous exoplanets, expanding our understanding of planetary systems beyond our own.
As astronomers continue to explore the cosmos, the findings regarding these super-puff planets provide valuable insights into the diversity of planetary types and their formation processes in the universe.
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