Chang'e 5 sample return mission |
Chang'e 5 sample return mission |
Oct 24 2012, 01:02 PM
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#301
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Solar System Cartographer Group: Members Posts: 10226 Joined: 5-April 05 From: Canada Member No.: 227 |
Of course, a mechanical or electronic failure is likely to end the mission long before the RTG wears out (same as on Curiosity)
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Nov 6 2012, 12:28 AM
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#302
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Junior Member Group: Members Posts: 86 Joined: 12-October 05 From: Beijing Member No.: 526 |
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Jan 8 2022, 12:53 AM
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#303
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Senior Member Group: Members Posts: 1452 Joined: 26-July 08 Member No.: 4270 |
In-situ detection of water at the Moon with Chang'e 5. 120 ppm in the regolith but a nearby rock had 180 ppm. Lunar interior may have more water.
https://www.science.org/doi/10.1126/sciadv.abl9174 -------------------- -- Hungry4info (Sirius_Alpha)
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Jan 9 2022, 10:00 AM
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#304
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Member Group: Members Posts: 127 Joined: 3-September 12 From: Almeria, SE Spain Member No.: 6632 |
Interesting.
Is there also some water detection in the samples brought back to Earth? Thorsten |
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Jan 12 2022, 01:51 PM
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#305
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Member Group: Members Posts: 185 Joined: 4-January 19 Member No.: 8523 |
Is there also some water detection in the samples brought back to Earth? Thorsten I believe this publication on Nature made the analisys: "Water in CE5 apatite and melt inclusions We studied a total of 23 basalt clasts (0.2–1.5 mm in size) from two CE5 soil samples (CE5C0100YJFM00103, about 1 g; CE5C0400YJFM00406, about 2 g; Extended Data Table 1)" "we estimated the water abundance of the bulk CE5 basalts from the modal abundance of apatite and its average water content, because apatite is the dominant water-bearing phase in mare basalts. The modal abundance of apatite in the CE5 basalts is determined to be approximately 0.4 vol%, using the surface areas of apatite in all basaltic clasts analysed (Supplementary Table 1). The average water content and δD value of the CE5 apatite measured by NanoSIMS 50L are 1,921 ± 910 μg g−1 and 578 ± 208‰ (N = 40), respectively" https://www.nature.com/articles/s41586-021-04107-9 -------------------- "The Earth is a very small stage in a vast cosmic arena"
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Jan 12 2022, 02:38 PM
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#306
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Member Group: Members Posts: 185 Joined: 4-January 19 Member No.: 8523 |
The modal abundance of apatite in the CE5 basalts is determined to be approximately 0.4 vol%... The average water content ... of the CE5 apatite measured by NanoSIMS 50L are 1,921 ± 910 μg g−1..." Correct me if i'm wrong,.. but that means a average of 200 ppm at the apatite part of the samples? -------------------- "The Earth is a very small stage in a vast cosmic arena"
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Jan 13 2022, 02:55 PM
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#307
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Member Group: Members Posts: 127 Joined: 3-September 12 From: Almeria, SE Spain Member No.: 6632 |
I'm also trying to understand it.
On page 50 they write: "As apatite is the major water-bearing phase in the CE5 basalts, a water abundance of 7 ± 3 μg g−1 for the bulk composition of the CE5 basalts was calculated from the average water content of apatite and its modal abundance of approximately 0.4 vol%" This is much lower than the 120-180ppm from the other paper or what SOFIA measured (200-400ppm or so). What is correct now? Thorsten |
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Jan 13 2022, 05:32 PM
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#308
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Member Group: Members Posts: 185 Joined: 4-January 19 Member No.: 8523 |
This is much lower than the 120-180ppm from the other paper or what SOFIA measured (200-400ppm or so).What is correct now? Thorsten I Believe that means we have a 192 ppm of water average on the apatite and they are suposing it can be used as parameter to undertand all sample, despite apatite being 0.4 vol% of the sample... either case i don't realy believe it is practical to remove 200 ppm of water from a stone.. it is 0.02%, this would be 200 liters by each cubic meter of stone. -------------------- "The Earth is a very small stage in a vast cosmic arena"
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Jan 13 2022, 08:10 PM
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#309
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Senior Member Group: Members Posts: 1075 Joined: 21-September 07 From: Québec, Canada Member No.: 3908 |
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Jan 13 2022, 08:30 PM
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#310
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Member Group: Members Posts: 127 Joined: 3-September 12 From: Almeria, SE Spain Member No.: 6632 |
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Jan 14 2022, 12:40 AM
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#311
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Member Group: Members Posts: 185 Joined: 4-January 19 Member No.: 8523 |
Yes... 0.2 liters One glass of juice. Ouch... i used cm3 instead of decimeter... if it was 200L it would have solved all moon problems... -------------------- "The Earth is a very small stage in a vast cosmic arena"
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