29 abril 2015
The sun’s surface is blisteringly hot at 10,340 degrees Fahrenheit — but its atmosphere is another 300 times hotter. This has led to an enduring mystery for those who study the sun: What heats the atmosphere to such extreme temperatures? Normally when you move away from a hot source the environment gets cooler, but some mechanism is clearly at work in the solar atmosphere, the corona, to bring the temperatures up so high.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/1oC4cQ1czcU/150429094830.htm
