The spacecraft will launch together June 17 aboard an Atlas V rocket from Cape Canaveral Air Force Station in Florida.

Using a suite of seven instruments, LRO will help identify safe landing sites for future human explorers, locate potential resources, characterize the radiation environment and test new technology.

LCROSS will seek a definitive answer about the presence of water ice at the lunar poles. LCROSS will use the spent second stage Atlas Centaur rocket in an unprecedented way that will culminate with two spectacular impacts on the Moon's surface.

"These two missions will provide exciting new information about the Moon, our nearest neighbor," said Doug Cooke, associate administrator of NASA's Exploration Systems Mission Directorate in Washington. "Imaging will show dramatic landscapes and areas of interest down to one-meter resolution. The data also will provide information about potential new uses of the Moon. These teams have done a tremendous job designing and building these two spacecraft."

LRO's instruments will help scientists compile high resolution, three-dimensional maps of the lunar surface and also survey it in the far ultraviolet spectrum. The satellite's instruments will help explain how the lunar radiation environment may affect humans and measure radiation absorption with a plastic that is like human tissue.

LRO's instruments also will allow scientists to explore the Moon's deepest craters, look beneath its surface for clues to the location of water ice, and identify and explore both permanently lit and permanently shadowed regions. High resolution imagery from its camera will help identify landing sites and characterize the Moon's topography and composition. A miniaturized radar will image the poles and test the system's communications capabilities.

"LRO is an amazingly sophisticated spacecraft," said Craig Tooley, LRO project manager at NASA's Goddard Space Flight Center in Greenbelt, Md. "Its suite of instruments will work in concert to send us data in areas where we've been hungry for information for years."

While most Centaurs complete their work after boosting payloads out of Earth's orbit, the LCROSS Centaur will journey with the spacecraft for four months and be guided to an impact in a permanently shadowed crater at one of the Moon's poles.

The resulting debris plume is expected to rise more than six miles. It presents a dynamic observation target for LCROSS as well as a network of ground-based telescopes, LRO, and possibly the Hubble Space Telescope. Observers will search for evidence of water ice by examining the plume in direct sunlight.

LCROSS also will increase knowledge of the mineralogical makeup of some of the remote polar craters that sunlight never reaches. The satellite represents a new generation of fast development, cost capped missions that use flight proven hardware and off the shelf software to achieve focused mission goals.

"We look forward to engaging a wide cross section of the public in LCROSS' spectacular arrival at the Moon and search for water ice," said LCROSS Project Manager Dan Andrews of NASA's Ames Research Center at Moffett Field, Calif.

"It's possible we'll learn the answer to what is increasingly one of planetary science's most intriguing questions."

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