BCE (or B.C.E.) and CE (or C.E.) BCE stands for Before the Common Era and it is basically equivalent to BC, except that it doesn't have the Christian religious connotations of BC. That makes the usage preferable for some scholars.
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This effect is called Rayleigh scattering, named after Lord Rayleigh who first discovered it. Shorter wavelengths (violet and blue) are scattered the most strongly, so more of the blue light is scattered towards our eyes than the other colours. You might wonder why the sky doesn't actually look purple, since violet light is scattered even more strongly than blue.