The discovery of water on the Moon could affect a telescope that will be installed on China's first lunar lander, scheduled in 2013, a Chinese astronomer was quoted as saying recently.
The announcement
In September 2009, scientists announced they had found a watery dew covering parts of the Moon. In sunlight, the water vaporises and is then broken down into molecules of hydroxyl, a compound comprising one atom of hydrogen and one oxygen.
These hydroxyl levels could have a serious impact on lunar observatories, Chinese astronomers said in a paper presented at the European Planetary Science Congress in Rome recently.
“We recalculated the amount of hydroxyl molecules that would be present in the lunar atmosphere and found that it could be two or three orders higher than previously thought,” said Zhao Hua of the Chinese Academy of Sciences, according to a press release.
Important ramifications
This has important ramifications for China's third lunar probe, Chang'e—3, which is designed to land on the Moon in 2013 with an ultraviolet telescope on board.
The equipment would operate on the Moon's sunlit surface, powered by solar panels. “At certain ultraviolet wavelengths, hydroxyl molecules cause a particular kind of scattering, where photons (particles of light) are absorbed and rapidly re-emitted,” Zhao said.
“Our calculations suggest that this scattering will contaminate observations by sunlit telescopes.
Radio astronomy would not be affected by the higher hydroxyl levels, although a radio telescope would ideally be placed on the far side of the Moon so that it is permanently shielded from interference from TV and radio signals from Earth.
