Oort Cloud from XKCD Oort Cloud from XKCD Related Posts So Long ISON? Comet C/2012 S1 ISON at Perihelion Photographing Comets in the Moonlight Comet C/2012 S1 ISON Share this:TweetWhatsAppEmail Author: Andrew An electrical engineer, amateur astronomer, and diver, living and working on the island of Hawaiʻi. View all posts by Andrew