NASA's Mercury Messenger: What It Learned Before It Crashed - New York Times

New York TimesNASA's Mercury Messenger: What It Learned Before It CrashedNew York TimesMercury's magnetic field is nearly four billion years old, researchers have found. A planet's magnetic field is generated by the flow of liquid iron deep in its core. While Earth's magnetic field helps shield life here from solar radiation, Mercury is ...and more »

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