NASA deliberately crashed a spacecraft into the Moon to find water
In short: To discover if the Moon was wet, NASA had to get its hands dirty. By intentionally crashing a rocket stage into a permanently shadowed crater, scientists created an artificial explosion that revealed secrets hidden for billions of years.
The mission began in the late 1990s when data from the Lunar Prospector spacecraft suggested the presence of hydrogen at the Moon's poles. Scientists hypothesized this might be water molecules (H2O), but they needed a way to sample material that had never seen direct sunlight. Because the Moon has very little axial tilt, certain craters near the south pole remain in perpetual darkness, with temperatures never rising above negative 280 degrees Fahrenheit. These conditions are ideal for trapping water ice, which would otherwise evaporate or 'burn off' in the Sun.
NASA developed a unique 'impact and flythrough' strategy to solve this. The Lunar Crater Observation and Sensing Satellite (LCROSS) carried a just over 40-foot-long section of its own rocket—the Centaur upper stage. On October 9, 2009, the spacecraft released this projectile into the Cabeus crater near the lunar south pole. The heavy rocket slammed into the surface at approximately 5,600 miles per hour (9,000 km/h), kicking up a massive plume of debris and soil into the sunlight.
The LCROSS spacecraft then had a frantic four-minute window to fly through this rising cloud. As the dust was exposed to light, any water ice vaporized, allowing the onboard cameras and instruments to identify its chemical components. Data proved revolutionary: testing showed 5.6 percent water ice, primarily as pure crystals, within Cabeus crater's deep lunar soil. This confirmed that the Moon is chemically active and possesses a water cycle, providing a vital resource for future human exploration.
The mission was part of NASA's now-canceled Lunar Precursor Robotic Program, originally funded by the Constellation program to return humans to the Moon. By repurposing an empty fuel tank as a projectile—a concept tested at the Ames Vertical Gun Range—NASA successfully demonstrated how high-speed impacts can be used as a tool for geological discovery.
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Sources
- Summary by Intellect · source: LCROSS Lunar Impact
- Also: What is LCROSS, the Lunar Crater Observation and Sensing Satellite? - NASA
- Also: LCROSS - NASA Science
- Also: LCROSS | Mission, Impact, & Facts | Britannica
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