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Why Is the Day Sky Blue? Why Is the Night Sky Black?

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No Wonder You Wonder!
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Abstract

On another planet, could the sky be green, red, or purple? After all, sometimes it’s green in spots and stripes on a winter night in the far north around Norway. How would you feel about being assigned to a planet with a totally green daylight sky, if you were a space explorer and were stationed on that planet for a 2-year tour of duty? Why is our blue sky (Fig. 1) black at night (Fig. 2)? (Well, maybe gray if you live in Los Angeles, instead of Santa Fe!) Why is the sky at high altitude black at midday like it was for Felix Baumgartner before he jumped from a height of nearly 40 km? [More recently, Google executive Alan Eustace jumped from 41 km and made his own sonic boom!]

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© 2016 Springer International Publishing Switzerland

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Phipps, C. (2016). Why Is the Day Sky Blue? Why Is the Night Sky Black?. In: No Wonder You Wonder!. Springer, Cham. https://doi.org/10.1007/978-3-319-21680-5_12

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