News Flash: The Moon , not so dry after all

Since man first touched the moon and brought pieces of it back to Earth, scientists have thought that the lunar surface was bone dry. But new observations from three different spacecraft have put this notion to rest with what has been called "unambiguous evidence" of water across the surface of the moon.

The new findings, detailed in the Sept. 25 issue of the journal Science, come in the wake of further evidence of lunar polar water ice by NASA's Lunar Reconnaissance Orbiter and just weeks before the planned lunar impact of NASA's LCROSS satellite, which will hit one of the permanently shadowed craters at the moon's south pole in hope of churning up evidence of water ice deposits in the debris field.

The moon remains drier than any desert on Earth, but the water is said to exist on the moon in very small quantities. One ton of the top layer of the lunar surface would hold about 32 ounces of water, researchers said.

"If the water molecules are as mobile as we think they are — even a fraction of them — they provide a mechanism for getting water to those permanently shadowed craters," said planetary geologist Carle Pieters of Brown University in Rhode Island, who led one of the three studies in Science on the lunar find, in a statement. "This opens a whole new avenue [of lunar research], but we have to understand the physics of it to utilize it."

Finding water on the moon would be a boon to possible future lunar bases, acting as a potential source of drinking water and fuel.

Apollo turns up dry

When Apollo astronauts returned from the moon 40 years ago, they brought back several samples of lunar rocks.

The moon rocks were analyzed for signs of water bound to minerals present in the rocks; while trace amounts of water were detected, these were assumed to be contamination from Earth, because the containers the rocks came back in had leaked.

"The isotopes of oxygen that exist on the moon are the same as those that exist on Earth, so it was difficult if not impossible to tell the difference between water from the moon and water from Earth," said Larry Taylor of the University of Tennessee, Knoxville, who is a member of one of the NASA-built instrument teams for India's Chandrayaan-1 satellite and has studied the moon since the Apollo missions.

While scientists continued to suspect that water ice deposits could be found in the coldest spots of south pole craters that never saw sunlight, the consensus became that the rest of the moon was bone dry.

But new observations of the lunar surface made with Chandrayaan-1, NASA's Cassini spacecraft, and NASA's Deep Impact probe, are calling that consensus into question, with multiple detections of the spectral signal of either water or the hydroxyl group (an oxygen and hydrogen chemically bonded).

Three spacecraft

Chandrayaan-1, India's first-ever moon probe, was aimed at mapping the lunar surface and determining its mineral composition (the orbiter's mission ended 14 months prematurely in August after an abrupt malfunction). While the probe was still active, its NASA-built Moon Mineralogy Mapper (M3) detected wavelengths of light reflected off the surface that indicated the chemical bond between hydrogen and oxygen — the telltale sign of either water or hydroxyl.

Because M3 can only penetrate the top few millimeters of lunar regolith, the newly observed water seems to be at or near the lunar surface. M3's observations also showed that the water signal got stronger toward the polar regions. Pieters is the lead investigator for the M3 instrument on Chandrayaan-1.

Cassini, which passed by the moon in 1999 on its way to Saturn, provides confirmation of this signal with its own slightly stronger detection of the water/hydroxyl signal. The water would have to be absorbed or trapped in the glass and minerals at the lunar surface, wrote Roger Clark of the U.S. Geological Survey in the study detailing Cassini's findings.

The Cassini data shows a global distribution of the water signal, though it also appears stronger near the poles (and low in the lunar maria).

Finally, the Deep Impact spacecraft, as part of its extended EPOXI mission and at the request of the M3 team, made infrared detections of water and hydroxyl as part of a calibration exercise during several close approaches of the Earth-Moon system en route to its planned flyby of comet 103P/Hartley 2 in November 2010.

Deep Impact detected the signal at all latitudes above 10 degrees N, though once again, the poles showed the strongest signals. With its multiple passes, Deep Impact was able to observe the same regions at different times of the lunar day. At noon, when the sun's rays were strongest, the water feature was lowest, while in the morning, the feature was stronger.

"The Deep Impact observations of the Moon not only unequivocally confirm the presence of [water/hydroxyl] on the lunar surface, but also reveal that the entire lunar surface is hydrated during at least some portion of the lunar day," the authors wrote in their study.

The findings of all three spacecraft "provide unambiguous evidence for the presence of hydroxyl or water," said Paul Lucey of the University of Hawaii in an opinion essay accompanying the three studies. Lucey was not involved in any of the missions.

The new data "prompt a critical reexamination of the notion that the moon is dry. It is not," Lucey wrote.

Where the water comes from

Combined, the findings show that not only is the moon hydrated, the process that makes it so is a dynamic one that is driven by the daily changes in solar radiation hitting any given spot on the surface.

The sun might also have something to do with how the water got there.

There are potentially two types of water on the moon: that brought from outside sources, such as water-bearing comets striking the surface, or that that originates on the moon.

This second, endogenic, source is thought to possibly come from the interaction of the solar wind with moon rocks and soils.

The rocks and regolith that make up the lunar surface are about 45 percent oxygen (combined with other elements as mostly silicate minerals). The solar wind — the constant stream of charged particles emitted by the sun — are mostly protons, or positively charged hydrogen atoms.

If the charged hydrogens, which are traveling at one-third the speed of light, hit the lunar surface with enough force, they break apart oxygen bonds in soil materials, Taylor, the M3 team member suspects. Where free oxygen and hydrogen exist, there is a high chance that trace amounts of water will form.

The various study researchers also suggest that the daily dehydration and rehydration of the trace water across the surface could lead to the migration of hydroxyl and hydrogen towards the poles where it can accumulate in the cold traps of the permanently shadowed regions.

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Create a Budget

Creating a budget is a great first step towards creating a better financial future. But it is just that - a first step in a lifetime journey. It’s what comes after that first step that determines how successful you are in the long run!
In no particular order, here are four points to keep in mind after you have taken that first step.
1) You need to stick to your budget.
This is the most obvious thing (and also the hardest one). Once the budget is in place, you have to ensure that you stick to it. If you budgeted $100 a week for food, you have to try and spend $100 (or less) a week on food. If you see a nice jacket in a store but you’ve already spent your clothes money for the month, you’ll have to come back another time.
But if you do overspend on your budget, or give in to the urge to buy something that wasn’t in the budget, don’t beat yourself up. Figure out why you broke the budget (were you carrying extra cash at the time? did you have your credit cards with you?), work out what you can do to stop it from happening again, and get back to the budget.
2) Don’t be afraid to tweak the budget - especially in the beginning.
A budget isn’t set in stone, especially in the beginning. Despite all your best efforts, it’s almost certain that there were one or more uncommon expenses that slipped your mind when you created the budget. Or you may have thought (or hoped) that you spent a certain amount of money on a particular category - like food - but in fact you really spend more.
If you missed an expense, the solution is simple - add it in to your budget, and take it into account every pay period. If you underestimated an expense, make doubly sure that it really is an underestimate. But if it is, simply change the figures in the budget to the new value and work with the new value from now on.
3) Remember to account for new and changing expenses.
It’s an unfortunate fact of life that the cost of living continues to go up. On the plus side, wages usually tend to go up as well (we’ll leave the debate about if they go up at the same rate for another day). You need to update your budget to take into account both changes.
For expenses that are variable (like the electricity bill), every few months you should go through the same process you did when you first came up with the average value - look at the past few bills, and work out what the average cost is. For expenses that are usually fixed (like a mortgage repayment), simply enter the new value in your budget when you find out about the change.
(Of course, for something like a loan repayment you might want to consider paying the old amount if the repay amount drops, just so you can pay the loan off faster).
4) Start again if things change.
Sometimes your life situation totally changes. You might move half way across the country for a new job. You might start (or stop) living with your partner. Maybe your kids move out of home, or you find out you have a new kid on the way. Whenever a major event like this happens, it is a good idea to go right back to the beginning with your budget and recreate it all. Not only is this a good way to be on top of your new situation from the very start, but it also gives you a good chance to look at all your expenses to re-consider if you really need to spend all the money you currently do.
Hope these tips are useful to you!