Huge Earth-like worlds could host reservoirs of water deep underground

By Leah Crane

Exoplanets may carry more water than we thoughtWLADIMIR BULGAR/SCIENCE PHOTO LIBRARYThere could be oceans’ worth of water hiding deep within giant planets. Minerals with water bound up in their molecular structure can remain stable at extremely high pressures, so they could act as reservoirs for water even inside planets much larger than Earth.
Earth has a reservoir of water like this. It is bound up in a mineral called ringwoodite, deep underground in our planet’s mantle, the layer between the surface and the core. But at higher pressures than those in the mantle, we are unsure how …

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