The sun is compsed of superheated, ionized plasma, which acts as a fluid and is greatly influenced by the intense magnetic fields generated whitin. This interaction between magnetic fields and electronically charged fluids is called "magnetohydrodynamics", and sun is the largest such system available for study, although it is not yet well understood. Solar eclipses offer a rare opportunity to view the upper layers of the sun's atmosphere from earth. Scientists hope to get a better look with the Parker Solar Probe, which launched earlier this year.
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