Monday, October 26, 2015

Airglow

Airglow (also called nightglow) is the very weak emission of light by a planetary atmosphere. In the case of Earth's atmosphere, this optical phenomenon causes the night sky never to be completely dark, even after the effects of starlight and diffused sunlight from the far side are removed.

File:Cupola above the darkened Earth.jpg
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talk nineteen to the dozen

  to speak rapidly and without stopping

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