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dhani — October 31, 2007 / 12:21 am
Bad Astronomy: “That’s as remote as the dark side of the Moon!” Good astronomy: “That’s as remote as the far side of the Moon!”
Quoted from badastronomy.com:
At the end of the album “Dark Side of the Moon” by Pink Floyd, there is a voiceover that actually says “There is no dark side of the moon. As a matter of fact, it’s all dark. The only thing that makes it look alight is the sun.” In a sense, that line is correct: the Moon is actually very dark: it only reflects on average about 10% of the light that hits it (the specific reflectivity changes depending on the lunar surface; some parts are very dark, while others can be pretty bright). As a comparison, slate reflects about 10% of sunlight that hits it. The reason the Moon looks so bright is is that it is sitting in full sunlight, and so there is a lot of light hitting it.
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