Atmospheric gases scatter blue wavelengths of visible light more than other wavelengths, giving the Earth’s visible edge a blue halo. At higher and higher altitudes, the atmosphere becomes so thin that it essentially ceases to exist. Gradually, the atmospheric halo fades into the blackness of space.
This astronaut photograph captured on July 20, 2006 from the ISS and shows a nearly translucent moon emerging from behind the halo.
Image credit: NASA
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