Sun Storm: A Coronal Mass Ejection . ... Credit Copyright: NASA , ESA , SOHO Consortium Explanation: What's happening to our Sun? Another Coronal Mass Ejection (CME)! ... While hints of these explosive events , called coronal mass ejections or CMEs, were discovered by spacecraft in the early 70s, this dramatic image is part of a detailed record of this CME's development from the presently operating SOHO spacecraft. ... Strong CMEs may profoundly influence space weather . ...