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Hi Valarie, The key here is not how far away from Earth a spacecraft is, but how far away from the Sun a spacecraft will have to travel. Since the intensity of sunlight falls of as the square of the distance away from the Sun, the further away a spacecraft will go from the Sun, the more difficult it...

Hi Crystal, I have not worked in the solar energy business either, but I think it is very important that we try to increase our use of alternate energy sources like solar power and wind power. Paulett made a very good point about many spacecraft being solar-powered. Scientists here at the University...