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exosphere |
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exosphere: see atmosphere atmosphere [Gr.,=sphere of air], the mixture of gases surrounding a celestial body with sufficient gravity to maintain it. Although some details about the atmospheres of other planets and satellites are known, only the earth's atmosphere has been well studied, the ..... Click the link for more information. . exosphere [′ek·sō‚sfir] (meteorology) An outermost region of the atmosphere, estimated at 300-600 miles (500-1000 kilometers), where the density is so low that the mean free path of particles depends upon their direction with respect to the local vertical, being greatest for upward-traveling particles. Also known as region of escape. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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To distinguish among these processes, spectrometers on the craft will compare the composition of the exosphere with that of surface rocks. Then there is the notion of accelerating oxygen and hydrogen from the outermost reaches of the atmosphere, or exosphere, downward into the nightside by means of magnetic and electric fields from the solar wind. But the ISS orbits 402 km (250 mi) above Earth in the exosphere (upper atmosphere). |
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