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Home International News

Moon’s water is useful resource, says Nasa

ToP by ToP
October 22, 2010
in International News
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There are oases of water-rich soil that could sustain astronauts on the Moon, according to Nasa.Scientists studied the full results of an experiment that smashed a rocket and a probe into a lunar crater last year.The impacts kicked up large amounts of rock and dust, revealing a suite of fascinating chemical compounds and far more water than anyone had imagined.A Nasa-led team tells Science magazine that about 155kg of water vapour and water-ice were blown out of the crater.The researchers’ analysis suggests some areas of lunar regolith, or soil, must contain as much as 5% by weight of water-ice.”That’s a significant amount of water,” said Anthony Colaprete, from the US space agency’s Ames research centre.“And it’s in the form of water-ice grains. That’s good news because water-ice is very much a friendly resource to work with. You don’t have to warm it very much; you just have to bring it up to room temperature to pull it out of the dirt real easy.”Just as a point of reference – in about a tonne of material, at about 5%, you’re talking 11-12 gallons of water that you could extract.”The Nasa-led team has published six papers in the American journal describing the findings of the 9 October, 2009, impacts of the LCROSS spacecraft and its companion rocket stage.The pair was targeted at the Moon’s southern pole – at Cabeus Crater, a depression so deep and dark that the odds of disturbing ice were thought to be very good.

The rocket stage went in first, followed a few minutes later by the LCROSS probe which gathered imagery and other data just before it too slammed into the surface.Another spacecraft, Nasa’s Lunar Reconnaissance Orbiter (LRO), was passing close by. It also was able to study the plume of material ejected into sunlight more than 15km above the rim of Cabeus.The suite of instruments deployed on that day has determined as much as 20% of this dust plume was made up of volatile compounds, including methane, ammonia, hydrogen gas, carbon dioxide and carbon monoxide.In addition, the instruments saw relatively large amounts of light metals, such as sodium, and mercury. There was even a signature of silver, although in tiny amounts.

Scientists say the water and mix of volatiles could be remnants of comet or asteroid impacts through the eons, but they reckon a number of quite complex chemical and physical processes are also working to cycle and migrate these substances around the Moon.The water-ice is not uniformly distributed across the southern pole. Rather, it is held in pockets.Some of these oases are, like in Cabeus, to be found in shadows where LRO’s Diviner instrument has sensed temperatures down to minus 244C. Under such conditions, ices will stay fixed for billions of years.But the research indicates there is probably water-ice even in areas which receive some sunlight through the year, provided it is buried in the soil.

“We’ve dubbed these newly discovered regions ‘lunar permafrost areas’; and they’re very extensive,” said David Paige, Diviner’s principal investigator.”This could facilitate future human and robotic explorers in their quest for understanding of the lunar ice, as well as its potential use as resource; because rather than having to brave the cold and dark conditions inside permanent shadow, they could land much more conventionally in areas where the sunlight is shining – at least for part of the year – and then dig a small distance below the surface and access the ice.” – Voanews

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