The Sun’s atmosphere is way, WAY hotter than its surface — here’s why – The Next Web

The visible surface of the Sun, or the photosphere, is around 6,000°C. But a few thousand kilometers above it a small distance when we consider the size of the Sun the solar atmosphere, also called the corona, is hundreds of times hotter, reaching a million degrees Celsius or higher.
This spike in temperature, despite the increased distance from the Suns main energy source, has been observed in most stars and represents a fundamental puzzle that astrophysicists have mulled over for decades.
In 1942,…

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