H elium could make up almost half the mass of the atmospheres of giant exoplanets that have migrated close to their stars, explaining why there’s a mysterious size gap among these worlds. Over 5,200 exoplanets have been confirmed, and many are larger worlds that orbit close to their stars, in some cases with orbital periods lasting just a few days. However, transit observations by NASA’s Kepler Space Telescope and now
PUFFY HELIUM PLANETS COULD EXPLAIN AN EXOPLANET SIZE MYSTERY
Mar 23, 2023
2 minutes
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