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Solar Sun Filter

	Eschenbach Solar Shields Yellow Filter Medium Sale Price: $49.99
	Solar Shield contrast-enhancing filters are available in 3 frame sizes: Small, Medium and Large. The small frame will fit patients who have smaller eye wear or who don?t wear eye wear at all, while the medium and large sizes will comfortably fit over a patient?s standard eye wear...

Solar Water Purification Inventions, What is new and exciting

With unpredictable weather in the world, there are purification inventions being developed so you can get safe water supply and health. Things like the New Orleans hurricane and other natural disasters have left areas in devastation. No food or drinking water, however a new solar water purification invention has been shown to help survivors with clean water. Ensure that water disinfected drinking is good. This is a small device uses the sun's ultraviolet rays to quickly clean water supply.

Is cleaned water supply so you can stay safe and so cheap. The rays kill bacteria and harmful viruses that can remain in the water. Others will avoid cholera typhoid, dysentery and other diseases that can seriously harm or death. This invention affecting thousands of people. It could be used to help clean sources their daily consumption, however, was made for emergencies. Depending on the type you receive, you may not even have to worry about making electricity use them because some depend on gravity for water flow.

This is a great development in water purifiers because they are able to use natural resources land. It will end water purification naturally and safely. This method is usually used by third world countries because it is also very cheap to use and it works very well when it comes to giving the best quality water. For more information see http://www.ewatertreatmentsystems.com/watertreatment/Buy_water_treatment_online.html

Although now is not going to help those with a major chemical contamination, but can be used to help filter the water of dirt and soil particles. For the moment, are focusing on everyday pollution that may occur, not those caused by disasters. You can expect to see further improvements to the system purification of solar energy and will be able to purify all water pollution discharges and important.

Right now, there are laboratories working on improving their devices and making them able to perform work as New Orleans. You can find out more about solar water purification by searching complete line. This is perhaps the method that could help improve their water system and water quality. This great start to something that will help everyone and the environment through of disasters and spills.

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Meade RB-70 filters?

Hello, I have a 700 mm RB-70 Telescope Meade and wanted to put sunscreen on the scope to see the sun, but do not know if this scope can use a sunscreen or not? Are sunscreens specific for telescopes telescope is true or universal as, for example, one eye? Thank you and if there is one that is out there for this telescope, please send the link. Thank you. Does Meade telescopes even allow sunscreens?

The only type of sunscreen that is safe is the kind that fits over the front of the telescope. To find out what size you need, you will have to measure the outside diameter of the front of your telescope. The best sunscreen I have found are those by Kendrick: http://www.kendrickastro.com/astro/solarfilters.html BaaderFilters # I do not recommend the projection method, since it concentrates an enormous amount of heat in the eyepiece. From eye many today are made of plastic, there is the risk of melting or catching fire to his eye. The concentrated beam of sunlight coming out of the eye is hot enough to light a cigarette.

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	Eschenbach Solar Shields Yellow Filter Medium Sale Price: $49.99
	Solar Shield contrast-enhancing filters are available in 3 frame sizes: Small, Medium and Large. The small frame will fit patients who have smaller eye wear or who don?t wear eye wear at all, while the medium and large sizes will comfortably fit over a patient?s standard eye wear...

	Eschenbach Solar Shields Yellow Filter Small Sale Price: $49.99
	Solar Shield contrast-enhancing filters are available in 3 frame sizes: Small, Medium and Large. The small frame will fit patients who have smaller eye wear or who don?t wear eye wear at all, while the medium and large sizes will comfortably fit over a patient?s standard eye wear...

	Eschenbach Solar Shields Amber Filter Small Sale Price: $49.99 Average Rating:
	Solar Shield contrast-enhancing filters are available in 3 frame sizes: Small, Medium and Large. The small frame will fit patients who have smaller eye wear or who do not wear eye wear at all, while the medium and large sizes will comfortably fit over a patients standard eye wear...

	Orion Solar Filter for ShortTube 4.5, 5.81" ID List Price: $79.95 Sale Price: $79.95
	Designed to fit snugly over the aperture of your telescope, these optical glass filters block 99.999% of incoming sunlight, allowing you to safely observe sunspots and solar granulation in the Sun's photosphere...

	Telescope Solar Filter by Seymour Solar for Meade ETX 125, 114EQ, and DS-2114 ATS Sale Price: $59.00
	This size filter will fit any telescope with an optical tube diameter of 143-149mm. It is made with a sturdy aluminum outer cell that houses an optical thin film aperture. The thin film is a .002" thick black polymer...

	Orion Solar Filter for 11" Schmidt-Cassegrain Telescopes, 12.31" ID List Price: $155.95 Sale Price: $155.95
	Designed to fit snugly over the aperture of your telescope, these optical glass filters block 99.999% of incoming sunlight, allowing you to safely observe sunspots and solar granulation in the Sun's photosphere...

	Telescope Solar Filter by Seymour Solar for Meade ETX 90 Sale Price: $49.00
	This size filter will fit any telescope with an optical tube diameter of 98-105mm. It is made with a sturdy aluminum outer cell that houses an optical thin film aperture. The thin film is a .002" thick black polymer...

	Observing the Sun with Coronado Telescopes (Patrick Moore's Practical Astronomy Series) List Price: $39.95 Sale Price: $24.30 Average Rating:
	The Sun provides amateur astronomers with one of the few opportunities for daytime astronomy. In order to see the major features of our nearest star, special telescopes that have a very narrow visible bandwidth are essential...

Solar Sun Filter

Optic Telescope Canada

Deer Hunting

International practices
New Zealand
See also: Hunting in New Zealand
New Zealand has had a number of introduced deer species in the absence of predators became to be considered a pest animal because of its effect on native vegetation. Since the 1950s the government employed hunters to cull the deer population. deer hunting is now a leisure activity. [Citation needed]
North America
The deer most sought after in North America, east of the Rocky Mountains, is the white-tailed deer. West of the Rockies, the mule deer is the dominant deer species. The main differences between the two, other than distribution, are the differences in the ears, tail, antler shape (the way each fork), and body size. [Citation needed]
Male white tail deer at night in Central Texas
The mule deer's ears are proportionally longer than the ears white-tailed deer, and resemble that of a mule. Mule deer have a black tipped tail which is proportionally lower than that of white-tailed deer. Buck deer of both species sprout antlers, the antlers of mule deer and rebranch branch forming a series of forms and, while white-tailed dollars tend to have a beam with several tips which come from it. white-tailed dollars tend to be smaller dollar mule deer. Both species lose their antlers in the spring. [Citation needed]
Moose and Moose are also popular game animals that are technically species of deer. However, hunting is not often referred to as deer hunting, big game is called. Them are considerably larger than mule deer or white-tailed deer, and hunting techniques are very different.
In Canada and Alaska, reindeer (caribou) are hunted extensively.
United Kingdom
There are six species of deer in the United Kingdom: deer, roe deer, fallow deer, Sika deer, deer, muntjac and Chinese water deer and hybrids of these deer. All are killed at a level that reflects their relative population, either for sport or for the purposes of slaughter. closed seasons for deer vary by species. The practice of declaring a ban in England dates back to medieval times, when it was commonly called month near and lasted from June 9 to July 9, although the dates real wide. It is illegal to use bows to hunt any wild animal in the UK under the Wildlife and Countryside Act 1981. Victorian dramatist WAS Gilbert said: "Deer-stalking would be a sport very well if only the deer had guns."
While the "deer stalking" is widely used among British and Irish athletes to mean almost all forms of deer shooting sports, the term was replaced in the use of North American sports for "deer hunting" - a term that in Britain and Ireland has historically been reserved only for the performance sport of deer-scented Search dogs, with the general on horseback armed followers.
Australia
In Australia, there are seven species of deer that are available for hunting. It is fallow deer, Sambar deer, red deer, Axis deer Rusa deer (Cervus elaphus timorensis Russa and timorensis moluccensis), Chital deer, elk and deer Hog.
Deer was first introduced to Australia between 1800 and 1803. All States / Territories have populations of deer, including many offshore islands. hunting deer in Australia is is prevalent in the eastern part of the country. Hunting access varies from state to state with different classifications of animal pests to play with some species receiving the protection of hunting seasons and the requirement of a permit or hunting license.
Method
North America
A New Hampshire hunting deer
There are five common methods of hunting deer: stalking, which consists of the following signs and trails of deer, hunting stand, waiting for deer are likely to travel (including the tree stands), still hunting, alternately walking silently and waiting concealed in the scavenger hunt, the line units, which consists of wash to a line of deer hunters, and hunting spot and stalk, which consists of detecting and stalking deer. Spot and stalk hunting is usually a hunting method used in places where there are large visible areas such as mountainous terrain where a person can see through the canyons. The other four methods are used in hunting areas such as hills or in a country that is more level, where a hunter can barely see over the trees or shrubs to detect and track deer. Scouting and stalking involves follow deer sign. Common symptoms include chasing deer rubs, scrapes, and tracks. Scrapes are places where U.S. dollars scratching the ground and under low branches urination on the edge of the fields, deer rub their faces in the low hanging branches leaving their scent. Bucks do this to mark territory and attract female deer. Deer tracks can reveal the size, age and species of deer. Rubs are marks on the trunks and lower branches of trees which indicate where U.S. dollars have touched the velvet from their horns, leaving a witness mark because it removes the bark of trees where the deer rubs. Another purpose of this is to mark territory with a visual signal. [Citation needed]
Modern methods of hunting
Deer hunting can be in a position that places the hunters above the line of sight of a deer. There are several types of media including portable hunting stands, climbing is hunting, is the staircase, is self-made, and each of the tripods which can be used for different methods of hunting. [Citation needed]
Deer hunting trophies may also be undertaken from ground blinds. These can be natural blinds, falls as dead and a brush; bail of hay in the open farm country, or specifically manufactured for this purpose. [Citation needed]
UK and Ireland
Representation of hunting deer with dogs in a 15th century version of The Book of Gaston Phebus hunting, MS. f. fr. 616
The vast majority of deer killed in the United Kingdom are harassed. The deer hunting phrase, however, has also been used to refer (in England and Wales) to the traditional practice of deer hunting packages of dogs is now illegal under the Hunting Act 2004.
In the late nineteenth and twentieth century, there were several packages staghounds hunt "deer taken in England and Ireland. red stag deer taken captive for the sole purpose of being hunted and captured alive. More recently, three packs of wild deer hunting staghounds cells of both sexes in and around Exmoor and New Forest Buckhounds deer hunting deer in the New Forest, the ultimate dissolution in 1997.
The practice of hunting with dogs, hunting, except for two dogs to flush deer to be shot by waiting marksmen, has been banned in the UK since 2005 and to date two people have been convicted of law.
There is a pack of stag hounds in Ireland and one in Northern Ireland, the previous operation under a license to hunt deer away.
Norway
Most deer hunting in Norway is by hunters driving the game towards other hunters placed in strategic locations in the field, although there are a fair bit of harassment. [Citation needed]
Australia
Most hunting methods in Australia are similar to those of North America, with the exception of deer Sambar that are commonly hunted with dogs.
Team
A pop-up pack-style blind
Many different weapons are allowed in several states in the U.S. during certain times of deer season. These include bows, crossbows, rifles, shotguns, pistols and muzzleloaders.
Archery season usually opens weeks or months before a state or local arms of the season and usually allows for several weeks or months later. Modern compound bows and recurve bows are used, as well as some primitive recurve arches and historical enthusiasts when permitted. Ballestas are often reserved for hunters with disabilities can not draw a bow, but allowed to be used in Alabama and Tennessee for any person with a disability or not [citation needed] and in Minnesota, Kansas and other states during the firearm season. Most of the arches and crossbows offer an effective range of 30-40 yards accurately.
Rifles, shotguns and pistols are commonly used for hunting deer. Most of the regions to limits the minimum size or gauge to be used, rimfire rifles and .22-caliber centerfire are often prohibited due to ethical concerns, although it has been used for hunting deer and larger in some cases. [Citation needed] Some areas of the United States bans hunting rifle completely. [Citation needed]
Muzzleloader hunting is also practiced. Modern Muzzleloading rifles equipped with synthetic stocks, telescopic and fiber optic sights Online ignition systems, advanced bullet designs conical or sabot, and black powder substitutes such as Pyrodex are much more effective than guns generations past. [Citation needed] However, many traditionalists still use the stock timber, iron-sighted rifles with traditional lead bullets and black powder round of charges. [Citation required]
Deer hunting with firearms, as the spear or sword, is still practiced in continental Europe, mainly in France. In such hunting, hunters are mounted on horseback and use packages deerhound dogs or dogs to track deer and unity. Only the masters of the game have the right to deliver the death blow while others simply mount mounted hunters to the chase. [Citation needed]
Alabama hunting permits staghorn during archery season.
Tools
Using a Hitch-Haul transport platform game harvested
The hunters use many tools, among which camouflage, tree stands or blinds, knives, vehicles, chain saws, and handheld GPS units. Camouflage has been used for some time and although it is very important, is not essential, especially during the firearm season when hunters are required to wear blaze orange. [Quote edit] An industry equipment suppliers and equipment suppliers has grown to hunters supply with the team.
See also
Animal welfare
Bayou Bucks (documentary)
Big Buck Hunter
Deer Farm
Deer horn
Deer Hunter - video game
Deer Avenger - Game
The deerskin trade
Reindeer hunting in Greenland
Deer
References
^ Naturenet: Shooting, Hunting and fishing seasons. Naturenet - Management and Conservation Camp.
^ Forests and chases of England and Wales: A College Glossary.St John, Oxford.
^ Grossmith, George, The Daily Telegraph, June 7, 1911
^ Http: / / www.gamecouncil.nsw.gov.au/
^ Bentley, A (1967), Introduction to the deer of Australia.
Gegelman ^, Andrew Hunt and stem Pot - The lost art. Nodak outdoors.
^ Http: / / www.telegraph.co.uk/htmlContent.jhtml?html=/archive/1997/07/29/nhun29.html
^ Http://news.bbc.co.uk/1/hi/england/somerset/7053016.stm
^ http://news.bbc.co.uk/1/hi/northern_ireland/4247341.stm
^ Http: / / debates.oireachtas.ie / DDebate.aspx? F = DAL20050126.xml & Dail = 29 & Ex = All & Page = 91
^ Http://www.kdwp.state.ks.us/news/Hunting/Hunting-Regulations/Deer/Legal-Guns-Bows
^ Department of Natural Resources of Minnesota (Minnesota DNR), hunting and capture Manual of Regulations (2007). Pp 5, 58.

EV
Hunting and shooting animals in North America
Wildfowl
Bobwhite Quail Chukar Hungarian Partridge Prairie Chicken Mourning Dove Ring-necked pheasant Ptarmigan Ruffed Grouse Sharp-tailed Grouse Snipe (Common Snipe) Spruce Grouse Turkey Woodcock
Waterfowl
Black Duck Canada Goose Canvasback Gadwall Greater Scaup Lesser Scaup Duck Mallard Northern Pintail Redhead Ross Goose Snow Goose Wood
Great game
Cimarron Razorback Sheep Bison Black Bear Brown Bear (Buffalo) Caribou Cougar (Puma) Elk Moose White-tailed deer Gray wolf Mountain goat Mule Deer Muskox Dall sheep, pronghorn Polar Bear
Other Quarry
American Alligator Bobcat Coyote Fox Squirrel Gray Fox Gray Squirrel Opossum Rabbit Raccoon Snowshoe Hare Red Fox
See also
Bear Big game hunting Deer hunting Waterfowl hunting Wolf hunting Upland hunting
Categories: | archery sport for dogs | Hunting in the UK | Hunting skills in the United States | Survival | Deer huntingHidden categories: All articles with unsourced statements | Articles with unsourced statements June 2009 | Articles lacking reliable references from December 2009 | Articles lacking reliable references from December 2007 About the Author

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Optic Telescope Canada

Wide Angle Telescope

	Super Wide Angle 16mm Plossl 1.25 Eyepiece Sale Price: $24.99
	SUPER WIDE ANGLE VIEW CHOCKING HAZARD - CONTAINS SMALL PARTS - NOT FOR CHILDREN UNDER 3

Nikon D90 review

One of the main attractions of this month had to be the Nikon D90, which is also the most expensive camera we've tested so far. Nikon introduced the D90 to replace D80 trust. The D80 is one of the best entry level mid-range cameras from Nikon.

The D90 has so much to prove before it can earn its place. Passing through the key features D90, certainly looks impressive. The D90 uses a CMOS sensor, 12.3 MP sensor rise from the 10.2 MP CCD sensor of the D80. The sensor size remains unchanged. Most entry level cameras are supplied with a 18-55 mm lens that can be very limiting for the type of pictures you can take. We received the camera with a DX-Nikkor 18-105 mm VR zoom lens.

This makes a good all-purpose computer wide angle and telescopic shot. The shape and size of the D90 is slightly bigger than the D60 we saw a few months ago. It's a little heavier than the D60 and D80 itself. The body is plasticy, but it feels very sturdy and the buttons are large as expected in any Nikon D-SLR.

The D90 now comes with a 3 inch screen that is incredibly vibrant and crisp. The other thing that makes the digital camera interesting is the inclusion of Live View that allows you to use the LCD to focus.

This is a feature rarely found on D-SLR. The D90 is without doubt one of the easiest operate the cameras, if you have a basic knowledge of using a decent camera point and shoot. All camera functions such as ISO, white balance, exposure metering and focus modes, can be accessed by clicking the appropriate button and rotating the dial. The shutter speed and aperture size have dedicated brand.

It is very difficult to criticize the D90 in the quality as well. The 12.3 MP CMOS sensor does its job well. Photos are sharp throughout the aperture range complete. The aim is not made for macro photography, so have difficulty with close shots. Yes, great close-ups can be triggered backing , and zooming into the target. Good depth of field can also be easily accomplished. The flash is powerful and good enough for indoor photography from time to time.

Auto mode works well with the autofocus. The approach is instant and no delay. There are a few hiccups autofocus time to time, but nothing that can not be fixed using the other autofocus modes support. As expected of any digital SLR camera, the manual mode gives total control of the camera. You will not be disappointed with the D90, if you like to select a default scenario, either - a dial to be present.

Another new feature is almost never seen in the D-SLR is the video recording. The D90 can capture up to 1280x720 resolution videos at 24 frames per second. What makes it even more special is that you can zoom and focus manually while recording video. Video quality is great and the frame rate fairly stable, but that you need to buy a fast SD / SDHC for it.

We would be lying if we say that we were not impressed with the D90. It's full of surprises. The camera is incredibly easy to use, has the performance, features, and is certainly light years ahead of the D80 in all aspects. Nikon has another winner on its hands and recommend this option if you have a serious interest in photography and also the money.

The Nikon D90 with the lens is priced at a whopping Rs. 89 890. The body itself can be bought for Rs. 69 950. This makes the D90 almost as expensive as the D300. It has more meaning if you spend more and go for the D300 instead.

Nikon lenses are known to be cheaper than some other brands, so you buy only one body and then a good lens can also be a good move. If you do not need the live view or video recording and even small changes Nikon has done, and then the older D80 is a better buy, especially with its price more favorable to the portfolio.

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astronomy binoculars.?

hello all, I just found a wicked prog called "Stellarium" and has re-sparked my interest astronomy. i cannot afford a telescope yet, because I am a student with no money, but I own a pair of binoculars - 12x50 praktica great sport angle of 6 degrees. Am I able to detect planets like Saturn and Venus with this? (Its a cloudy night atm so i cannot test) and how it would look Orion nebula? How much I have to spend on a reasonably decent telescope? beginner astronomer! thanks for the answers tom

Saturn and Venus are visible to the naked eye, so are easily visible in 12x50 binoculars. With the binoculars will soon be able to see the phase of Venus (at the moment is approaching) and brightest of Saturn, Titan. You will not be able to see Saturn's rings, requiring about 25x when well placed, and are not well placed at this time. Remember that telescopes Galileo were not much more powerful than binoculars. There was a little increase (about 20x), but less open and the large amount of chromatic aberration more. The Orion Nebula will look great in binoculars, especially in a dark sky. Here are some websites with good information about telescopes Beginners: http://www.scopereviews.com/begin.html http://www.gaherty.ca/tme/TME0702_Buying_a_Telescope.pdf http: / / observers.org / beginner / For jrfbeginner.html more advanced information, read Phil Harrington's Star Ware, 4th edition (Wiley). You get the most value for your money with a Newtonian reflector on a Dobsonian mount, such as: ~ = ~ = category_id http://www.telescope.com/control/category/ dobsonians pcategory / telescopes / ~ VIEW_INDEX = 0 / ~ VIEW_SIZE = 1000000 http://www.skywatchertelescope.net/swtinc/product . php? class1 = 1 & class2 = 106 buy in a store that specializes in telescopes and astronomy, either locally or online, do not buy in department stores, discount stores or eBay as everything they sell is junk. Find your local astronomy club and try out different telescopes at one of their star parties: http://www.skyandtelescope.com/community/organizations

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	Wide-Angle lens kit for the Tikka XP series of headlamps. Includes red, green, and blue lenses.

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	This easy-to-use Cstar® periscope is made of lightweight, durable plastic and includes shatterproof mirrors and big handles for small hands. It's a great educational tool and is fun for kids and adults...

	Meade® 1.25" 24mm Series 5000 Super Wide Angle Eyepiece List Price: $169.00 Sale Price: $84.50 Average Rating:
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Bull's-Eye Impact Crater. Credit: NASA/JPL/University of Arizona

Here's some doses of coolness and craziness for your Friday. This top image is one of the latest from the HiRISE camera on the Mars Reconnaissance Camera, and shows what looks like a target on the Red Planet. Researchers from the HiRISE team aren't sure yet whether this is two impacts — one impact that occurred dead center within another — or just unusual subsurface layering within one impact. I'm voting for two impacts, just because it is such a cool, lightning-strikes-twice concept. While no ejecta from the interior crater can be seen, the team says the ejecta could have been removed by extensive periglacial modification. Additionally, the floor fill around the inner crater resembles impact ejects elsewhere at this latitude, and some of the "landslides" to the East could be flow-back of ejecta off the walls of the larger crater. Likely the team will be looking closer at this impact to sort out the history and likelihood of a double impact. (UPDATE: I just saw that the Bad Astronomer has posted a more detailed CSI into this image, which you should read!)

Now, this next one is the crazy part…

Mars industrial site with (a) nozzle spray and (b,c) domes. Credit: NASA, annotations from Farsight Institute, via the SciGuy.

There's a guy, and apparently a team of "remote viewing experts" who have found what they believe is a massive industrial complex on Mars. Eric Berger at his SciGuy blog at the Houston Chronicle wrote about this today, and its just way to wacky to believe, kind of like the people who zoom in on rocks on Mars and say they see Bigfoot. Anyway, these folks say they can even tell that there are artificial structures at this site with a laboratory. What's more they can see that there are lifeforms there wearing uniforms, and there are more men than women. Yep.

Check out SciGuy for all the nonsense.

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This schematic shows the daytime cycle of hydration, loss and rehydration on the lunar surface. Credit: University of Maryland/McREL.

"Water cycle on the Moon" is a phrase that many people – including lunar scientists – were never expecting to hear. This surprising new finding of ubiquitous water on the surface of the Moon, revealed and confirmed by three different spacecraft last year, has been one of the main topics of recent discussion and study by lunar researchers. But figuring out the cycle of how water appears and disappears over the lunar day remains elusive. As of now, scientists suspect a few different processes that could be delivering water and hydroxyl (OH) to the lunar surface: meteorites or comets hitting the Moon, outgassing from the Moon's interior, or the solar wind interacting with the lunar regolith. But so far, none of the details of any of these processes are adding up.

Dana Hurley from The Johns Hopkins University Applied Physics Laboratory is part of team of scientists attempting to model the lunar water cycle, and she discussed the work at the NASA Lunar Science Institute's third annual Lunar Forum at Ames Research Center, July 20-22, 2010.

"When we do the model, we assume the way that the water is lost is through photodissociation, and so that sets the timescale," Hurley told Universe Today. "And using that timescale the amount that is coming in through the solar wind or micrometeorites can't add up to the amount observed if it is in steady state, so something is not jiving."

Photodissociation involves the breaking up of a substance into simpler components by the radiant energy of sunlight.

It appears the amount of water varies over the course of the lunar day. Two observations a week apart by a spectrometer on the repurposed Deep Impact spacecraft (now called EPOXI) showed the region that was near the Moon's terminator at dawn had a detectable amount of water and hydroxyl, and a week later when it was near noon, those substances were gone. But the new region at dawn then had H2O and OH.

One theory holds that the water and hydroxyl are, in part, formed from hydrogen ions in the solar wind. By local noon, when the moon is at its warmest, some water and hydroxyl are lost. By evening, the surface cools again, and the water and hydroxyl return.

But, Hurley said, the solar wind in steady state does not reproduce the observed surface density of water and hydroxyl.

Additionally, looking at the other possible sources — the known source rate of micrometeoroids and comets — doesn't provide the amount of observed H20 and OH either.

"We'd really like to have a lot more observations to understand how it evolves over the course of the day," Hurley said.

Water in Polar Regions on the Moon Credit: ISRO/NASA/JPL-Caltech/Brown Univ./USGS

In her talk, Hurley said her team has been trying to look at all possible angles and ideas, including recent larger comet hits on the Moon, or potentially a seasonal event where water deposited at winter poles could be released when it warms up in summer. But so far none of these ideas have been tested or modeled, and as of now do not provide a solution to the daily cycle of water that was observed.

She also noted that since there are obviously some unique processes going on, the interaction between the surface and atmosphere needs more study.

"The surface and atmosphere are coupled," Hurley said in an interview with Universe Today. "The atmosphere is produced from the surface; there is no atmosphere that lasts for a long time on the Moon and it is constantly being produced and lost. And so it is coming from the surface, either from something that is coming from the lunar regolith grains or something that is interacting with those grains, whether it is solar wind or something that is impacting. So, the surface is the source of the atmosphere and that atmosphere comes back and interacts with the surface again. And you really have to understand that whole system."

So, what is her best guess as to the source of the water?

Hurley said there has to be some sort of recycling going on within the regolith, and perhaps a complex surface chemistry that allows the H20 and OH to exist for longer periods of time, which would better explain the surface density.

"What I've looked at is what could be happening in the atmosphere and how things hop around from the surface up and then back down to the surface," she said. "The lunar regolith is rather loose, and these small particles and gases can go down within the regolith and be within the top several centimeters and work their way down and back out. So there is an exchange going on in that top layer that is kind of acting as a reservoir. That is my best guess of what is going on."

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