Large coronal hole near the sun's north pole
Saturday, July 20, 2013 - 07:30
in Astronomy & Space
Astronomers captured an image of a gigantic coronal hole hovering over the sun's north pole on July 18, 2013, at 9:06 a.m. EDT. Coronal holes are dark, low density regions of the sun's outermost atmosphere, the corona. They contain little solar material, have lower temperatures, and therefore, appear much darker than their surroundings.