The last eruption in the region — a lava flow — was over 70,000 years ago. In a recent study, USGS investigators with collaborators at Oregon State University and the University of Wisconsin-Madison ...

not even as a lava flow — a result that is known thanks to the fascinating field of magnetotellurics.

These vast, linked lava plains are now thought to be compositionally ... measurements representative of most of the Moon. Magnetotellurics uses natural variations in surface electric and magnetic ...

"The LMS instrument will be the first extraterrestrial application of magnetotellurics." Mare Crisium is an ancient, 350-mile-diameter impact basin that subsequently filled with lava, creating a ...