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发帖数: 1994 | 1 Moonset, Planet Earth
Credit: STS-35 Crew, NASA
Explanation: During the Astro-1 astronomy mission of December, 1990, Space Shuttle
astronauts photographed this stunning view of the setting full moon poised above the Earth's
limb. In the foreground, towering clouds of condensing water vapor mark the extent of the
troposphere, the lowest layer of the planet's life-sustaining atmosphere. Strongly scattering
blue sunlight, the upper atmospheric layer, the stratosphere, fades dra |
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