Magnetic Fields of Asteroids Lasted Hundreds of Millions of Years

January 21, 2015 7:49 PM

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Magnetic Fields of Asteroids Lasted Hundreds of Millions of Years

The magnetic fields of planetary building blocks lasted for a surprisingly long time in the solar system's early days, a new study suggests.

The magnetic fields of these big asteroids were apparently generated by the same process that drives Earth's global magnetic activity, and could have persisted for hundreds of millions of years after the objects' formation, researchers said.

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