NASA's IRIS Eyes Our Sun

If you’ve ever stood beside a roaring fire, you know it can get pretty hot. And if you get too hot, you could just walk away, because the farther you are from a heat source, the cooler it is around you.

But that does not always hold true everywhere.  

The surface of the sun is about 6,000 degrees Celsius, but its upper atmosphere is about one million degrees hotter, even though it’s farther from the sun’s heat-generating core.

Scientist Jeffrey Newmark says it’s …

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