http://web.gps.caltech.edu/~jorourke/index.html
Generating Magnetic Fields in Earth, Venus, and Super-Earth Exoplanets
Earth’s global magnetic field has survived for at least 3.5 billion years, yet Venus lacks a dynamo today. I will explore possible explanations for this dichotomy and discuss related implications for the internal structure and evolution of massive, rocky exoplanets.
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