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Jan 6 2006, 08:55 PM
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#101
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Senior Member Group: Members Posts: 2454 Joined: 8-July 05 From: NGC 5907 Member No.: 430 |
ADMIN NOTE: Please note that this topic was unavoidably poltical before the 'No Politics' rule. Please restrict future comments to the mission/spacecraft/news updates etc.
WHAT'S NEW Robert L. Park Friday, 6 Jan 06 Washington, DC DEEP SPACE CLIMATE OBSERVATORY KILLED. http://bobpark.physics.umd.edu/index.html -------------------- "After having some business dealings with men, I am occasionally chagrined,
and feel as if I had done some wrong, and it is hard to forget the ugly circumstance. I see that such intercourse long continued would make one thoroughly prosaic, hard, and coarse. But the longest intercourse with Nature, though in her rudest moods, does not thus harden and make coarse. A hard, sensible man whom we liken to a rock is indeed much harder than a rock. From hard, coarse, insensible men with whom I have no sympathy, I go to commune with the rocks, whose hearts are comparatively soft." - Henry David Thoreau, November 15, 1853 |
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Oct 31 2016, 11:35 PM
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#102
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Senior Member Group: Members Posts: 1656 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
Indeed it's interesting to imagine the aspects of symmetry between looking up at the sky and looking down from space - I can almost get dizzy looking up and imagining this.
If we assume no aerosols, then I agree the scattered light upward by the sky is much more. This is because the Rayleigh phase function is pretty similar upward and downward, and the downward diffuse light only has about 8% reflected by the water. If aerosols are present the scattered/reflected ratio may vary some (considering the asymmetry factor), though probably not change the main conclusion for most cases. A fun example to help illustrate some of this is to note that Lake Titicaca is much darker than the ocean areas, due to the high altitude and less air present. -------------------- Steve [ my home page and planetary maps page ]
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