A powerful engine roils deep beneath our feet, converting energy in the Earth's core into magnetic fields that shield us from the solar wind. Similar engines drive the magnetic activity of the sun, other stars and even other planets—all of which create magnetic fields that reinforce themselves and feed back into the engines to keep them running.
from General Physics News - Science News, Physics News, Physics, Material Sciences, Science https://ift.tt/2Q36oWd
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