The sun is the brightest object in the sky and has been studied for hundreds of years, but it continues to hide some secrets. The visible sun is extremely hot, at a temperature of about 5500 degrees. Surprisingly, on top of this sits a layer of gas, called the corona, which has a temperature of almost 2 million degrees, over 300 times hotter than the actual surface of the sun. What heats up the corona to 2 million degrees has been an enduring mystery with no satisfactory answer.
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Source: Phys.org