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Physical sciences/Earth sciences/Geology/Physical geology/Volcanology/Magma

Enceladus, one of Saturn's smaller moons, may have a subsurface ocean at least the size of the U.S.' Lake Superior in its southern hemisphere.


An artist’s depiction of the twin spacecraft Ebb and Flow that comprise NASA’s GRAIL mission.
[Image credit: NASA/JPL-Caltech/MIT]

A giant asteroid that struck the moon long ago, creating what is possibly the largest and oldest impact crater in the entire solar system, may explain the surprisingly strong magnetic fields that emanate from the lunar crust today, researchers say in the 8 March issue of Science.