Venus may have a secret underground ocean of magma

摘要

VENUS may be hiding a sea of magma under its entire surface that could help us learn about Earth's deep past. When both planets formed, they were probably molten, with what might have been magma oceans on their surfaces. Over billions of years, their crusts solidified, leaving a layer of magma underneath a stony shell. Earth's magma ocean hardened into rock about 2 billion years ago, but Venus's may remain.