The sun's corona is visible to the naked eye during the total solar eclipse of August 21, 2017, as viewed from Malheur County, Oregon. The corona is an extremely hot plasma aura — as much as 450 times the temperature of the sun's surface — that extends millions of miles out from the solar disk that is typically visible. The sun's surface is far brighter than the corona, usually outshining it. During a total solar eclipse when the moon blocks the view of the main body of the sun, the corona becomes visible. The bright star Regulus is visible near the bottom left corner of the image.
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