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Blue light is scattered more than other wavelengths by the gases in the atmosphere, giving the Earth a blue halo when seen from space.
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Limb view, of the Earth's atmosphere. Colours roughly denote the layers of the atmosphere.
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This image shows the moon at centre, with the limb of Earth near the bottom transitioning into the orange-coloured troposphere. The troposphere ends abruptly at the tropopause, which appears in the image as the sharp boundary between the orange- and blue- coloured atmosphere. The silvery-blue noctilucent clouds extend far above the Earth's troposphere.
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Space Shuttle Endeavour appears to straddle the stratosphere and mesosphere in this photo. "The orange layer is the troposphere. This orange layer gives way to the whitish stratosphere and then into the mesosphere."
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Earth's atmosphere backlit by the Sun in an eclipse observed from deep space onboard Apollo 12 in 1969.
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