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quote:Originally posted by TitanscapeHow hot is it in there, in the moon's core? Perhaps it is not completely cooled yet. Perhaps it will never cool right down. So do you think there may be some nuclear activity still going on deep inside? Or is the fuel all used up?Titanscape
quote:The data were collected in April 1998 while the Moon swung through the north tail lobe of Earth's magnetosphere. The spacecraft magnetometer detected changes in Earth's magnetic field thus giving the researchers the information they needed to estimate the size of the Moon's core. That size came out to be very small. Hood and his collaborators report a lunar core radius of only 340 km ± 90 km. For an iron-rich composition, a core of this size represents merely 1 to 3% of the Moon's total mass. In contrast, Earth's core is about 33% of our planet's total mass. This new evidence for a small lunar core strengthens the popular giant impact hypothesis which says that the Moon formed from hot, rocky debris after a Mars-sized object smashed into the early Earth. Down to its very core, the Moon has a unique history in our Solar System.