NASA Catalogs 3,260 Mid-Size Exoplanets as Solar System’s Missing Class Dominates Galaxy
Updated
Updated · spacedaily.com · Jul 18
NASA Catalogs 3,260 Mid-Size Exoplanets as Solar System’s Missing Class Dominates Galaxy
1 articles · Updated · spacedaily.com · Jul 18
Summary
NASA’s confirmed exoplanet archive now lists 3,260 planets larger than Earth and smaller than Neptune, out of more than 6,000 confirmed worlds overall.
That count underscores a striking pattern: super-Earths and sub-Neptunes fill a size range completely absent in our solar system, making the “missing middle” one of astronomy’s most common planet classes.
Webb observations have pushed those worlds to the forefront because their atmospheres are easier to probe than Earth-size planets, yet clouds and haze often flatten spectral signals and leave their true makeup unclear.
The mismatch is forcing scientists to treat the solar system as a special case, with leading explanations including early planetary migration, collisions, or Jupiter’s growth starving the inner system of material.
The broader implication is for habitability studies: astronomers must pin down where rocky Earth-like planets end and gas- or water-rich sub-Neptunes begin before estimating how common true Earth analogues are.