If a little kid ever ask you just why the sky is blue, you look at him or her right in the eye and say, "it's because of quantum effects involving Rayleigh scattering combined with a lack of violet photon receptors in out retinae'. -Phillip Plait
If you travelled at the speed of light, it would take 1 second to get to the moon, 8 minutes 20 seconds to get to the sun, and 2000 years to get out of Milky Way.
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