NASA Discoveries Reveal Diverse Super-Earths, Challenging Understanding of Planetary Evolution
Super-Earths—planets larger than Earth but smaller than Neptune—exhibit a wide variety of types, ranging from rocky and water-rich worlds to extreme, exotic environments.
Astronomers have identified a diverse collection of “super-Earth” exoplanets—worlds a few times the mass of Earth but smaller than Neptune—scattered across our galaxy. These planets exhibit a wide range of compositions, from rocky to gas-rich, and some combine both characteristics. Despite their abundance, their precise nature remains uncertain, as none are located near our solar system, though NASA notes they are common across the galaxy.
A Spectrum of Super-Earths
Recent NASA-supported studies highlight the remarkable diversity of super-Earths in both composition and environment. Some may be water worlds, covered entirely by deep global oceans. Others orbit within the habitable zones of their stars, where liquid water could exist, with candidates including TOI-715 b, Kepler-62 e, and Kepler-452 b.
For instance, Kepler-452 b, often called “Earth’s Cousin,” orbits a Sun-like star at nearly 1 AU and may be rocky, although its temperature could be too high to support life. Not all super-Earths, however, enjoy such stability. Kepler-725 c has a highly elliptical orbit, spending only part of its path in temperate regions, while others endure extreme day–night temperature swings.
Some super-Earths are truly exotic. LHS 3844 b is likely tidally locked, with one side perpetually scorching and the other frozen, and may lack a substantial atmosphere altogether. These discoveries reveal the incredible diversity of super-Earths and continue to challenge astronomers’ understanding of planetary formation and evolution.
