Researchers Identify Two Low-Density Super-Puff Exoplanets Orbiting TOI-791

An international team of researchers recently identified two giant exoplanets orbiting the Sun-like star TOI-791 that exhibit exceptionally low densities. These planets, categorized as “super-puffs,” possess a mass-to-volume ratio significantly lower than that of any previously documented gas giant. The discovery provides new data regarding the physical characteristics of planets outside our solar system and offers researchers a rare opportunity to examine atmospheric compositions that deviate from established planetary formation models.

The research team measured the density of these celestial bodies, noting that their composition results in a physical structure lighter than candy floss. Because these planets maintain such low densities despite their large size, they challenge existing scientific theories concerning how gas giants form and how they retain their atmospheres over time. Scientists now intend to use these findings to refine current models of planetary evolution, as the existence of such low-density objects requires a re-evaluation of the processes that govern the growth and stabilization of giant planets in distant star systems.

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Date: June 25, 2026

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GOAI