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Solar power
June 1, 2005 12:56 PM EST | Outdoor Living | Email to Friend
Our sun, a fairly average star when you come right down to it, has been blazing away for nearly 4 billion years now, and will probably be doing the same that long from now. Every year it delivers about 1 ½ billion billion (that's 1.52 x 10 to the 18th!) kilowatt-hours (kWh) to planet Earth---over than 1,000 times more energy than is needed to meet all current human requirements. The average U.S. household, for purposes of comparison, consumes about 8,500 kWh per year.
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