Ever since aurora chasers discovered Steve, a mysterious ribbon of purple light in the night sky, scientists have wondered whether it might have a secret twin. Now, thanks to a photographer's keen eye, and data from ESA's Swarm satellites, we may.
Aurora-like STEVE phenomenon has a secret twin that appears only before dawn, study finds yahoo.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from yahoo.com Daily Mail and Mail on Sunday newspapers.