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Monday, February 22, 2010

Sundog Plus Speeding Rocket Equals Wonder!



John sends this. Totally cool!
Solar Dynamics Observatory Launch, Feb 11, 2010.

A sun dog is a prismatic bright spot in the sky caused by sun shining through ice crystals. The Atlas V rocket exceeded the speed of sound in this layer of ice crystals, making the shock wave visible from the ground.

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