A huge coronal hole — shaped like a question mark — appears on the Sun: https://t.co/iWskKVvZHT @yulsman pic.twitter.com/Rrs1WrBag5
— Discover Magazine (@DiscoverMag) December 31, 2017
A huge coronal hole — shaped like a question mark — appears on the Sun: https://t.co/iWskKVvZHT @yulsman pic.twitter.com/Rrs1WrBag5
— Discover Magazine (@DiscoverMag) December 31, 2017