Enormous Sun Hole Poses Threat to Earth

A large dark hole, known as a coronal hole, wider than 60 Earths has opened up on the sun's surface, emitting powerful streams of unusually fast radiation called solar wind. The solar wind is heading towards Earth and could potentially trigger a moderate geomagnetic storm, leading to radio blackouts. NASA explains that coronal holes appear dark because they are cooler, less dense regions with open, unipolar magnetic fields, allowing the solar wind to escape more easily into space.