The presenceof water on the moon may be a boon for future manned bases, but new research suggestsit might also put a major crimp in plans for ambitious telescopes on the lunarsurface.
As the moleculesof moonwater vaporize insunlight, the scattering process could heavily distort observations taken by anytelescopes built on the moon in the future, the new study found.
"Lastyear, scientists discovered a fine dew of water covering the moon," said astronomerZhao Hua, a scientist with the Chinese Academy of Sciences. "This watervaporizes in sunlight and is then broken down by ultraviolet radiation, forminghydrogen and hydroxyl molecules."
The researchers found that those lunarhydroxyl molecules may be present in substantially more quantities thatpreviously thought ? levels high enough to pose an interference orcontamination risk to any telescopes on the moon's surface.
The moon'spotential as a site for building astronomical observatories has been a conceptdiscussed since the Space Race between the United States and former SovietUnion to send humans to the lunar surface. [Gallery:Future Moon Bases]
Initially,scientists thought the moon's surface was bone dry. But that all changed in 2009when observations by several spacecraft from NASA, Japan and India returned definitiveproof of the chemical signature for water, as well as water ice at the moon's poles.
Millions of tons of water ice have been discovered in permanently shadowedcraters at the moon's north pole. One probe found water ice hidden in cratersat the lunar south pole, while other observations found that water molecules werepresent in small quantities on the moon's surface.
The researchalso has important implications for the upcoming lunar missions, includingChina's unmanned Chang'e 3 moon lander mission, which is currently scheduled tolaunch in 2013.
The landeris expected to operate on the moon's sunlit surface and be equipped with asolar-powered ultraviolet telescope. China's second lunar probe, Chang'e 2, isdue to launch later this year.
"Atcertain ultraviolet wavelengths, hydroxyl molecules cause a particular kind ofscattering where photons are absorbed and rapidly re-emitted," Zhao said."Our calculations suggest that this scattering will contaminateobservations by sunlit telescopes."
With itsface pointed away from Earth, the moon's far side is permanently shielded againstinterference from our planet, and radio observations ? unlike opticaltelescopes ? would not be affected by the higher lunar hydroxyl levels, theyadded.
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