Saturday, April 12, 2008



The Solar System

Saturn's Aurora

Saturn's auroral displays are caused by an energetic wind from the Sun that sweeps over the planet, much like Earth's aurora or the phenomenon that causes fluorescent lamps to glow. Unlike the Earth's aurora, which is occasionally seen in the nighttime sky, Saturn's aurora is seen only in ultraviolet light that is invisible from the Earth's surface; hence it can be observed only from space.

Courtesy of J.T. Trauger (JPL), NASA, and NSSDC.

Dear Peter,

Glad you liked the "Puttin' on the Ritz" posting -- an amazingly durable song. I heard my daughter humming it the other day.

Going to Toronto next month -- watch for Canadian-stamped cards.


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