And they can reach over 10,000 degrees Celsius, exactly the sort of obstacle you'd want to avoid when flying a spacecraft into the sun. And the next layer is just as perilous: the photosphere.

Why the Sun's Surface Looks as if it Were Bumpy, Granules Found to be About 2200 Miles in Diameter, 100 Degrees Hotter Than the Remainder By Henry Norris Russell Join Our Community of Science Lovers!