< STS055-45-9 >

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Image Caption: STS-55 Earth observation taken aboard Columbia, Orbiter Vehicle (OV) 102, shows a spectacular sunset view over South America and the cleanest atmosphere since before the volcanic eruptions of 1991, according to NASA scientists studying the STS-55 photography. A dark cloud layer is evident at an altitude of 7 to 9 kilometers. Five kilometers higher, a pink layer of sulfuric acid droplets and ammonium sulfate particles begins at the tropopause and extends upward into the stratosphere to 19 kilometers. Above that, blue scattering by the atmosphere diminishes until, at an altitude of 60 kilometers, the blackness of space is predominant.