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K2-18 b is 8.6 times as massive as Earth and has a diameter about 2.6 times as large as our planet.
An illustration shows a hycean world – an exoplanet with a liquid water ocean beneath a hydrogen-rich atmosphere - orbiting a red dwarf star. Based on observations by the James Webb Space Telescope, the exoplanet K2-18 b might fit in this category. This illustration was obtained by Reuters on April 16, 2025.
Credit: A. Smith, N. Madhusudhan/University of Cambridge/Handout via REUTERS NO RESALES. NO ARCHIVES. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY.
