Astrophile
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- Aug 30, 2013
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I came across this fellow who claimed that if we went personally to Pluto we would be groping around in almost total darkness. In fact, he claimed that an approaching astronaut would not be able to detect Pluto with the naked eye because of the dimness of sunlight reaching it. That the only reason we see those bright landscapes is because they are artificially enhanced. Is this true?
No, it isn't. If we could go to Pluto at its present distance from the Sun, the solar illumination would be nearly 400 times as bright as the Full Moon. It would still be too dark for plants to generate energy by photosynthesis, but it would be more than a million times brighter than the limit for human vision.
Second, if the astronaut had good eyesight, he or she would be able to see Pluto with the naked eye at a distance of about 80 million kilometres, or about 50 million miles. At that distance Pluto would look like a star of magnitude 5.5; the astronaut would need a small telescope to be able to see its disk.
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