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not at all. >> reporter: green auroras are the most common. red are the rarest, seen just six to ten times each decade. this is one of parkhurst's favorite shots. >> the entire sky was red prior to this and it looked like you were on mars. it never gets old. every show is like a fingerprint. you're experiencing that moment and it's over. >> reporter: then he waits until the next time nature's night light returns. ben tracy, cbs news, anchorage, alaska. >> pelley: and that's the "cbs evening news" for tonight. for all of us at cbs news all around the world. good night. captioning sponsored by cbs capt captioned by media access group at wgbh access.wgbh.org