Contains:  Extremely wide field
Milky Way and air glow, AstroGG

Milky Way and air glow

Milky Way and air glow, AstroGG

Milky Way and air glow

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Description

Picture taken on the slopes of Mauna Kea, Hawaii.

The greenish glow near the horizon is air glow (or night glow).

From Wikipedia:

Airglow is caused by various processes in the upper atmosphere, such as the recombination of atoms, which were photoionized by the sun during the day, luminescence caused by cosmic rays striking the upper atmosphere and chemiluminescence caused mainly by oxygen and nitrogen reacting with hydroxyl ions at heights of a few hundred kilometres.

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Milky Way and air glow, AstroGG

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Space landscapes