Weeks after a story shot across the Web claiming that the imminent explosion of a nearby star would result in the appearance of a second sun in the sky — a story that was later debunked — two suns were caught on camera yesterday in China. The suns — one fuzzy and orange, the other a crisp yellow orb — appeared side-by-side, one slightly higher than the other.
What's going on? Life's Little Mysteries, a sister site to Space.com, asked Jim Kaler, the University of Illinois astronomer who squelched the excitement over the aforementioned exploding Betelgeuse and who has written books on the day and night sky. The double sun image is an effect of optical refraction, Kaler said, but it's a "pretty darn rare" one, and one not fully explained by science.
Mirages appear when particles in the atmosphere refract, or bend, light. This typically happens near the horizon, where air is thicker, though, and mirages are usually aligned vertically above or below the original source of the light — not beside it, like in the video. It's possible, Kaler said, that an unusually thick patch of atmosphere wandered in front of the sun to create the unusual effect.
"This is not a common optical phenomenon that we're seeing here," said Grant Perry, an atmospheric scientist at the University of Wisconsin Cooperative Institute for Satellite and Meteorological Studies. "I'm asking myself if this is an artifact of the lens, but if that were the case — if it's reflections of the lens elements — then the images would move in relation to each other as the camera moves," Perry said. "But that doesn't happen."
http://www.msnbc.msn.com/id/41927089/ns/technology_and_science-space/?GT1=43001
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