NASA Briefs Preliminary Plume Findings from Moon Mission |
NASA Briefs Preliminary Plume Findings from Moon Mission |
Nov 10 2009, 09:26 PM
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Member Group: Members Posts: 239 Joined: 18-December 07 From: New York Member No.: 3982 |
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Nov 14 2009, 01:02 PM
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#2
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Member Group: Members Posts: 293 Joined: 22-September 08 From: Spain Member No.: 4350 |
It could be from the strength of the spectral signal against the background.
They said 100kg is the estimated lower limit in the field of view. Many volatiles were quickly vaporized and expanded away. |
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Nov 14 2009, 05:41 PM
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Senior Member Group: Members Posts: 2173 Joined: 28-December 04 From: Florida, USA Member No.: 132 |
It could be from the strength of the spectral signal against the background. Right. I thought the 100kg was an estimate of what was actually seen in a narrow field of view and that they are not ready to estimate what was in the entire plume or in the entire excavated area. |
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Guest_Zvezdichko_* |
Nov 14 2009, 06:08 PM
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Guests |
Right. I thought the 100kg was an estimate of what was actually seen in a narrow field of view and that they are not ready to estimate what was in the entire plume or in the entire excavated area. I already see a discussion on what 100kg means is going on. 100 kg per 20x20kms crater means it's quite dry. But a narrow field would require a whole new line of calculations and investigations, which I don't see it will happen in the next several weeks. |
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Nov 14 2009, 07:44 PM
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#5
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Newbie Group: Members Posts: 6 Joined: 17-September 09 Member No.: 4945 |
I already see a discussion on what 100kg means is going on. 100 kg per 20x20kms crater means it's quite dry. But a narrow field would require a whole new line of calculations and investigations, which I don't see it will happen in the next several weeks. The crater diameter is about 20 meters. This gives roughly 1-10 ppm water by volume, if 100 kg represents the total amount of H2O in the ejecta (which is uncertain). ( 3.14*(10 m)^2 * (2 m) = 10^4 cubic meters; (100 kg H2O) * (1 m^3 / 1000 kg) = 0.1 cubic meter H2O; (0.1 cubic meter H2O) / (10^4 cubic meters total) = 10^-5 = 10 ppm H2O ) ( changing the depth-to-diameter ratio from 1:10 to 1:5 gives roughly 1 ppm H2O. ) |
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