But before we get into that — overnight Tuesday to Wednesday there was a positively huge coronal mass ejection, which is to say, an explosion on the Sun. The image below is an actual photograph of the event (taken from video shot by the Solar and Heliospheric Observatory). The Sun is illustrated by the small circle at the center; the solid blue ring is blacking out the zone that’s too bright to photograph, and the burst to the upper left is the ejection before it got very large.