NASA’s TESS finds two ultra-light planets orbiting TOI-791
NASA’s TESS discovered two ultra-light exoplanets, TOI-791 b and TOI-791 c, challenging formation theories due to their cotton candy-like density. Their rare system offers key insights into how giant
NASA’s Transiting Exoplanet Survey Satellite (TESS) has spotted two planets so light and fluffy they’re being compared to cotton candy. The worlds, na
Read Full Story at Engadget →Why This Matters
The discovery of TOI-791 b and TOI-791 c challenges conventional models of planetary formation, particularly for gas giants orbiting close to their stars. These "cotton candy" worlds—with densities rivaling spun sugar—suggest that some exoplanets may evolve in ways that defy traditional theories, prompting a re-examination of how planetary systems, including our own, take shape.
Background Context
TESS, NASA’s Transiting Exoplanet Survey Satellite, has revolutionized the hunt for exoplanets by scanning nearly the entire sky for telltale dips in starlight. While ultra-low-density planets were once thought to be rare anomalies, recent findings suggest they may be more common than assumed, with some existing in systems previously deemed inhospitable to such fragile worlds.
What Happens Next
Follow-up observations with the James Webb Space Telescope could reveal atmospheric compositions, offering clues about how these planets retained their puffy atmospheres despite extreme radiation from their host star. Researchers will also scrutinize neighboring systems for similar anomalies, potentially reshaping theories about planetary migration and evolution.
Bigger Picture
The growing catalog of low-density exoplanets underscores how diverse planetary architectures can be, challenging the notion that solar systems follow a predictable path. As detection methods improve, these findings may force astrophysicists to reconsider the role of stellar radiation, collisions, and even exotic formation mechanisms in sculpting the cosmos.
