A giant dark hole has appeared on the sun's flaming surface, a recently-taken NASA picture has revealed. So far, scientists are stumped by why this spectacular phenomenon, known as a "coronal hole," occurs.
"The Sun starts 2015 with an enormous coronal hole near the South Pole," scientists of NASA's Solar Dynamics Observatory wrote in their blog, having posted a picture of the flaming sun with a gaping dark space in its lower part.
The sun's glowing comes from the "trapped" particles. The coronal holes "contain little solar material, have lower temperatures, and therefore, appear much darker."
The coronal holes on the sun's poles may be seen for five or more years. Their shape can vary greatly, though.
What modern science knows is that "coronal holes" are places where particles leave the sun's surface at huge speeds - of up to 500 miles per hour (800 kilometers per hour). What's still unclear is why this is happening.