An Attractive Opportunity: Unpacking Earth's Magnetic Field - Now. Powered by Northrop Grumman.

What causes Earth's magnetic field, and how does the field protect life on our planet?

What critical component does our planet have that just-down-the street solar neighbor Mars is missing? Water’s not a bad guess, and life always tops the list when tantalizing new hints about Martian … [+6307 chars]

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