This picture taken on June 19, 2013 shows the bright arch of the Milky Galaxy over Crater Lake in Oregon. The green-ish glow in the background is caused by the light emitting atoms in Earth's atmosphere as they merge at night after being separated during the day from the energy emitted by sunlight. From the blue hue, to green, and then to the orange of the setting sun, its interesting to see how light behaves and the different colors that can be see through the interaction of light emitting atoms and the atmosphere.
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