Talk:Lunar water

"There's not one flavour of water on the Moon; there's a range of everything from relatively pure ice all the way to adsorbed water," said the mission's chief scientist Anthony Colaprete, from Nasa's Ames Research Center. . --BatteryIncluded (talk) 04:03, 9 March 2010 (UTC)

In the March 18, 2010 press release by NASA they speak of the "discovery of 600 million metric tons of water", however, this is very misleading and imprecise. As explained above and in this Wikipedia article, what they found is hydroxyl group, and in NASA's press release (image caption) you can read:

"The Mini-SAR has imaged many of the permanently shadowed regions that exist at both poles of the Moons. These dark areas are extremely cold and it has been hypothesized that volatile material, including water ice, could be present in quantity here."

So, what they found is cold dark spots, and are working on hypotheses. The Moon teams in NASA are putting the best possible spin to this so that they get funding to go back to the Moon, so these releases may be politically motivated. Let's place more importance to the published scientific articles. --BatteryIncluded (talk) 15:21, 21 March 2010 (UTC)

Thanks for your observation. I guess I was suckered. I have modified the text to make the hypothetical nature of the discovery more explicit. --Ben Best (talk) 17:34, 21 March 2010 (UTC)

• The end result of several edits seems to have been to remove all mention of the Mini-SAR results from the lead section. Was that the intention? 86.133.54.12 (talk) 21:58, 21 March 2010 (UTC)

The purpose should be to state what is known (hydroxyl group detected) and include some of the hypotheses. --BatteryIncluded (talk) 23:43, 21 March 2010 (UTC)

I'm not sure if Mini-SAR is capable of distinguishing "hydroxyl". To quote NASA:

"Mini-SAR is a lightweight (less than 10 kg) imaging radar. It uses the polarization properties of reflected radio waves to characterize surface properties. Mini-SAR sends pulses of radar that are left-circular polarized. Typical planetary surfaces reverse the polarization during the reflection of radio waves, so that normal echoes from Mini-SAR are right circular polarized. The ratio of received power in the same sense transmitted (left circular) to the opposite sense (right circular) is called the circular polarization ratio (CPR). Most of the Moon has low CPR, meaning that the reversal of polarization is the norm, but some targets have high CPR. These include very rough, fresh surfaces (such as a young, fresh crater) and ice, which is transparent to radio energy and multiply scatters the pulses, leading to an enhancement in same sense reflections and hence, high CPR. CPR is not uniquely diagnostic of either roughness or ice; the science team must take into account the environment of the occurrences of high CPR signal to interpret its cause."

I take on board the cynicism that NASA are bigging up the results for political/funding reasons, but they really do seem quite definite that the instrument has detected ice deposits near the moon's north pole (See http://www.nasa.gov/mission_pages/Mini-RF/multimedia/feature_ice_like_deposits.html). Unless there's something I'm missing, this is important enough to go into the lead section. 86.134.115.202 (talk) 03:37, 26 March 2010 (UTC).

The hydroxyl determination or discovery was done with other instruments. I have no time now but I can describe it later. Cheers, --BatteryIncluded (talk) 18:52, 26 March 2010 (UTC)

Yes, I'm aware of that. As I have tried to make clear throughout this exchange, I am talking about the Mini-SAR experiment. 86.137.136.203 (talk) 21:58, 26 March 2010 (UTC)

Now NASA is claiming 5.6 - 8.5% pure water ice crystals (not hydroxyl bound) in the Cabeus crater, should we updte the article?:
"the water is in the form of almost pure ice grains mixed in with the rest of the soil, and is easy to extract. The ice is about 5.6 percent of the mixture, and possibly as high as 8.5 percent of it, Dr. Colaprete said." (source here) --BatteryIncluded (talk) 21:52, 21 October 2010 (UTC)

Updated Main Article To Latest (definitive) Findings re Detected Water Concentration -> A later definitive anaylsis found the concentration of water to be "5.6 ± 2.9% by mass."^[1] Drbogdan (talk) 20:11, 22 October 2010 (UTC)

A Moonwater article has appeared, I believe this should redirect to this much fuller article. What do others think? Graeme Bartlett (talk) 02:17, 19 March 2010 (UTC)

Agreed. My bad for not thinking to check for "Lunar water", I'll redirect. — Aldaron • T/C 03:55, 19 March 2010 (UTC)

I was extremely doubtful that they would ever get evidence that said it was there. Now I'm changing sides. http://www.ustream.tv/recorded/11029718

The introduction lays a larger portion on the doubt, newer evidence supersedes most of the citations in the intro. — Preceding unsigned comment added by Moonus111 (talk • contribs) 03:37, 11 December 2010 (UTC)

Agreed, and indeed the entire article needs a rewrite. Many sources are contradicted by the new evidence from LCROSS and Diviner.Kodrin (talk) 03:01, 16 December 2010 (UTC)

The section "Lunar water discovery" has been plonked in as a subsection of the lead section (itself a nonstandard practice) without any regard for the information already present in the article or the pre-existing article organisation. This information needs to be properly integrated with the rest of the article. 86.146.108.247 (talk) 04:10, 7 November 2012 (UTC)

I am still uncertain whether the prominence and emphasis of the "Lunar water discovery" section dedicated to the M3 results is justified. Important though they no doubt are, my impression was that these results were just one more piece of evidence in a long history of observation and debate, and not the kind of revelatory and suddenly definitive "discovery" that the section heading suggests. Does anyone else have any view on this? I'm wondering if that section should be merged into "History of observations". 86.128.4.93 (talk) 14:39, 10 March 2013 (UTC)

I agree with you. As far as I am concerned, please feel free to do the change. BatteryIncluded (talk) 16:10, 10 March 2013 (UTC)

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Why there is a page called Lunar water? It is not useless because there are interesting things but i think that tis page must be only a section(a great section) of the page moon. Do you agree?

--Matmaru (talk) 12:59, 14 March 2017 (UTC)

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Hi, I just edited the second sentence on the article to remove the reference to "liquid" water, and specify that the referenced discovery was specific to the "sunlit" surface as the previous statement was factually incorrect and not specific enough. Liquid water cannot exist on the surface of the moon, and we already knew that ice existed on the shadowed surface of the moon. However, I believe that this opening statement needs further work to clarify that the water at the surface is NOT liquid water, since regular readers might not understand that "water" does not mean "liquid water". I see in the history that this opening paragraph used to specifically state that liquid water cannot persist at the surface of the moon, and I feel that it should be changed back to that form to remove confusion for the regular reader. However, I'm unfamiliar with the history of why this may have been changed, so I didn't make further edits to avoid making unnecessary or redundant changes. Help from others more familiar with the history of the article is needed.Mddesan (talk) 16:19, 27 October 2020 (UTC)

Hi everyone, I was just taking this out at Colonization of the Moon because it is too far off from the main issue, but maybe it is of use here:

On September 24, 2009, Science magazine reported that the Moon Mineralogy Mapper (M³) on the Indian Space Research Organization's (ISRO) Chandrayaan-1 had detected water on the Moon.^[1] M³ detected absorption features near 2.8–3.0 μm (0.00011–0.00012 in) on the surface of the Moon. For silicate bodies, such features are typically attributed to hydroxyl- and/or water-bearing materials. On the Moon, the feature is seen as a widely distributed absorption that appears strongest at cooler high latitudes and at several fresh feldspathic craters. The general lack of correlation of this feature in sunlit M³ data with neutron spectrometer H abundance data suggests that the formation and retention of OH and H₂O is an ongoing surficial process. OH/H₂O production processes may feed polar cold traps and make the lunar regolith a candidate source of volatiles for human exploration.

The Moon Mineralogy Mapper (M³), an imaging spectrometer, was one of the 11 instruments on board Chandrayaan-1, whose mission came to a premature end on 29 August 2009.^[2] M³ was aimed at providing the first mineral map of the entire lunar surface.

Lunar scientists had discussed the possibility of water repositories for decades. They are now increasingly "confident that the decades-long debate is over" a report says. "The Moon, in fact, has water in all sorts of places; not just locked up in minerals, but scattered throughout the broken-up surface, and, potentially, in blocks or sheets of ice at depth." The results from the Chandrayaan mission are also "offering a wide array of watery signals."^[3][4]

On November 13, 2009, NASA announced that the LCROSS mission had discovered large quantities of water ice on the Moon around the LCROSS impact site at Cabeus. Robert Zubrin, president of the Mars Society, relativized the term 'large': "The 30 m crater ejected by the probe contained 10 million kilograms of regolith. Within this ejecta, an estimated 100 kg of water was detected. That represents a proportion of ten parts per million, which is a lower water concentration than that found in the soil of the driest deserts of the Earth. In contrast, we have found continent sized regions on Mars, which are 600,000 parts per million, or 60% water by weight."^[5] Although the Moon is very dry on the whole, the spot where the LCROSS impactor hit was chosen for a high concentration of water ice. Dr. Zubrin's computations are not a sound basis for estimating the percentage of water in the regolith at that site. Researchers with expertise in that area estimated that the regolith at the impact site contained 5.6 ± 2.9% water ice, and also noted the presence of other volatile substances. Hydrocarbons, material containing sulfur, carbon dioxide, carbon monoxide, methane and ammonia were present.^[6]

In March 2010, ISRO reported that the findings of its mini-SAR radar aboard Chandrayaan-1 were consistent with ice deposits at the Moon's north pole. It is estimated there is at least 600 million tons of ice at the north pole in sheets of relatively pure ice at least a couple of meters thick.^[7]

In March 2014, researchers who had previously published reports on possible abundance of water on the Moon, reported new findings that refined their predictions substantially lower.^[8]

In 2018, it was announced that M³ infrared data from Chandrayaan-1 had been re-analyzed to confirm the existence of water across wide expanses of the Moon's polar regions.^[9]

The Chinese lander Chang'e 4 and its rover Yutu 2 are on the lunar surface on the far side of the Moon in the South Pole-Aitken Basin, analyzing the lunar surface to assist in the search for water.

In 2020, NASA's SOFIA observatory, a Boeing 747 equipped with a telescope, helped find molecular water on sunny surfaces of the Moon, after studying Clavius crater. Nsae Comp (talk) 16:07, 13 November 2021 (UTC)

This page should probably make (brief) mention that Leonardo Da Vinci, in the Codex Leicester, proposes that the moon's entire surface was covered in water. — HTGS (talk) 05:22, 20 July 2023 (UTC)

•  Done --Thereisnous (talk) 11:38, 13 July 2024 (UTC)