halo CME References halo CME astronomy Ask Anything Homework Help Written by The Information Architects of Encyclopaedia Britannica The Information Architects maintain a master list of the topics included in the corpus of Encyclopædia Britannica, and create and manage the relationships between them. The Information Architects of Encyclopaedia Britannica Britannica AI Ask Anything Learn about this topic in these articles: coronal mass ejection/ Properties…launched toward Earth are called halo CMEs because as they approach Earth, they appear larger than the Sun, making a “halo” of bright coronal emission completely around it. Read More…launched toward Earth are called halo CMEs because as they approach Earth, they appear larger than the Sun, making a “halo” of bright coronal emission completely around it. Read More