Why the sun’s atmosphere is hundreds of times hotter than its surface – Phys.org

The visible surface of the sun, or the photosphere, is around 6,000°C. But a few thousand kilometers above ita small distance when we consider the size of the sunthe 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 sun’s main energy source, has been observed in most stars, and represents a fundamental puzzle that astrophysicists have mulled over for decades.
In 1942,…

Click here to view the original article.