Eclipse watchers will go after the biggest solar mystery: Why is the corona so hot?

Usually when you move away from a heat source, it gets cooler. Not so in the sun’s atmosphere.

multi-wavelength mosaic of the sun

THE KITCHEN SINK  There are a lot of ways to study the sun, as shown in this multi-wavelength mosaic from NASA’s Solar Dynamics Observatory. During the eclipse, physicists will take every possible route to figuring out why the corona is so hot.

NASA Goddard Space Flight Center

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