Moon mystery: How long did its magnetic field last?

December 4, 2014 7:48 PM

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Moon mystery: How long did its magnetic field last?

In the pantheon of planetary bodies, the moon is a puzzle piece that doesn’t quite fit. There are the rocky planets, spheres of a certain heft with a layer cake-like structure of core, mantle, and crust. Then there are the asteroids, little more than pieces of rubble from the early solar system that have far less structure inside.

The moon stands alone: smaller than a planet, bigger than an asteroid.

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