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Researchers discover a network of fractures in Gale Crater filled with Opal, a water-rich mineraloid. This water-rich subsurface network would have been shielded from modern harsh surface conditions, allowing for a potentially habitable environment on Mars in a more recent era.
astrobiology.comSubmitted by GeoGeoGeoGeo t3_101okaq in science
GeoGeoGeoGeo t1_j5suvl3 wrote
Reply to comment by thulesgold in Earth's inner core seems to be slowing its spin according to new research published in Nature Geoscience. The study authors suggest this might be part of an approximately 70-year cycle where the core speeds up and slows down relative to the rest of the planet. by shiruken
There is a suggested different spin rate between the inner solid core and liquid outer core. The difference, however, is exceptionally small, and they both rotate at the same speed to within 0.001%.
The difference in speed is believed to be a result of two competing forces: The gravitational tug of the surrounding mantle, and the torque induced by the electromagnetic field from the outer core.
So when they report that its stopped spinning they mean relative to the mantle, same as when they say its reversed, and sped up.