Exoplanets Hold Vast Water Reserves Deep Within Their Cores

New research reveals that most water on rocky exoplanets is trapped in their interiors, challenging previous assumptions about surface oceans.

Iron cores of exoplanets can contain up to 95% of their water, sequestered during their molten magma stage.
This internal water storage suggests many exoplanets are more water-rich than previously believed.
The James Webb Space Telescope has identified water vapor in the atmosphere of exoplanet TOI-270d, hinting at significant interior water.
The study impacts how astronomers interpret mass and radius data of exoplanets, potentially revising estimates of their water content.
Planets with shallow oceans and significant interior water may be more common, altering the search for habitable worlds.