The interior of Mars hides a huge secret. New analysis of seismic data collected by NASA's InSight Mars rover shows that there may be a vast ocean of radioactive magma hidden beneath the surface of Mars, with a depth of up to 125 miles - the Martian magma ocean Totally unlike anything found on Earth.

"This material does not exist on Earth," geophysicist Amir Khan of ETH Zurich in Switzerland, lead author of one of the analyses, told The New York Times.
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