3soccer
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6dogs4us
Here you go:
| 15 years ago. Rating: 2 | |
Basically, it has no colour: it is transparent. At night, when the Sun and Moon are below the horizon, it is black, except where the stars shine through it. When the Moon rises, it turns gray: light scattered by the air molecules, but not bright enough to trigger the colour receptors in our eyes. When the Sun is in the sky, it turns blue because of Rayleigh scattering by air molecules. It is still transparent, though, because you can see the Sun and Moon through it, and even bright planets and stars if you know exactly where to look. When the Sun is low in the sky, or just below the horizon, the sky shows various colours due to complex scattering and refraction.
julie
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