NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Space shuttle over Earth's horizon. Photograph of the space shuttle Endeavour taken by astronauts on board the International Space Station. The horizon (seen here as the diagonal black and orange line from top to bottom) is known as Earth's limb. The orange layer is the troposphere. The whitish layer above it is the stratosphere and above that, the mesophere. Photographed in February 2010.
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