A severe geomagnetic storm may be coming — what does that mean? wtop.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from wtop.com Daily Mail and Mail on Sunday newspapers.
Known as a fairly rare cannibal CME — for Coronal Mass Ejection — and could make the Northern Lights visible in the U.S. on Thursday night into Friday morning…