WASHINGTON - A NASA rocket crashed into the moon Friday, sending a huge plume of dust above the surface in an experiment scientists hope will provide data about ice hidden in the perpetually dark lunar craters.
Major telescopes around the world were aimed at the Caebus crater on the moon’s south pole for the 1130 GMT impact of the Lunar Crater Observation and Sensing Satellite (LCROSS).
Astronomers in NASA’s mission control said the craft’s instruments had been working properly and that data from the collision would begin arriving shortly, though it would be weeks before they could say for certain whether water was present.
The rocket deliberately crashed into the moon at 9,000 km per hour, kicking up a plume of dust that scientists hope to analyze for traces of water that they believe are abundant in the cold, shadowy craters.
The impact was designed to mimic that of the large, natural asteroids that slam into the moon several times a month.
The NASA probe is targeting a 100-km wide, four-kilometre deep crater and was timed to strike when lighting conditions are ideal for observing the impact.
Despite the concerns of some naysayers in the blogosphere, the moon will not be harmed by the event.
“The impact has about a million times less on the moon than a passenger’s eyelash falling to the floor of a (Boeing) 747 during flight,” said Daniel Andrews, LCROSS project manager.
The total event - from impact until the dust settles - lasted just 120 seconds, but scientists say the experiment will produce valuable information to be collected on nine instruments, including five cameras that capture images in colour, thermal and near-infrared images.
Simultaneously, images of the impact were captured by the companion Lunar Reconnaissance Orbiter, a satellite now circling the moon, as well as the Hubble Space Telescope and terrestrial telescopes. The composition of the material kicked up by the impact will help scientists deduce whether water is present on the moon.
When seen from the ground with an amateur telescope, the dust cloud amounted to a dim shimmer across a shadow adjacent to the crater.
Data from three deep-space missions, including India’s Chandrayaan-1, late last month revealed that there are small, but widespread amounts of water across the entire surface of the moon. That announcement is seen as complementing, not preempting, the LCROSS mission.
Astronomers said before the impact that new data from $79-million LCROSS mission will complement the earlier findings because water is believed to be much more abundant in the craters. The findings could aid future manned missions to the moon, which could establish long-term outposts.
NASA scientists said that it is possible for frozen water to have remained in the moon’s craters for billions of years, because the bottoms of the craters are never reached by sunlight and protect any ice from evaporation into the thin lunar atmosphere.
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