A pretty massive coronal hole was recently detected on the Sun by NASA’s Solar Dynamics Observatory. The area—nearly the size of 50 Earths—is discharging material into space at remarkable speeds. It may look frightening, but astronomers say it’s nothing actually to worry about. According to NASA these holes are magnetically exposed regions that produce high-speed solar winds. These dark, low density areas of the corona—the sun’s outmost atmosphere—comprise little solar material, have lower temperatures, and therefore seem much darker than their surroundings. Coronal holes are usual, appearing at different places and with more frequency at different times throughout the Sun’s activity cycle.
The coronal hole was captured on October 10, 2015. The image above was captured in wavelengths of 193 angstroms, which falls outside the limits of human vision (Image Credit:NASA/SDO)