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Is there some substance on Venus or some kind of material, because neither bodies have any source of light.

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    $\begingroup$ Virtually everything reflects light to some degree. $\endgroup$ – Hohmannfan Apr 8 '16 at 6:04
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    $\begingroup$ The cheese. It's the cheese. $\endgroup$ – Ginasius Apr 8 '16 at 12:54
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The sun is an excellent source of light for all the planets and moons, although it gets a little dodgy way out near Pluto. The moon reflects about 10% of the sunlight that hits it, that's why we see it. Venus' albedo is about 0.75, what with its clouds and all. That means 75% of the sunlight that hits it is reflected back into space for us to see.

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