A deliberate crash to reveal the Moon's hidden water cycle

Space · Published 22 October 2026 Swipe more like this →

In short: To find water on the Moon, NASA didn't just look for it; they smashed into the surface. By intentionally crashing a spacecraft into a permanently shadowed crater, scientists were able to kick up dust and expose materials that hadn't seen sunlight in billions of years.

To offer unique lunar environment details, the LRO/LCROSS project departed Cape Canaveral Air Force Station via an Atlas V rocket on 18 June 2009. While the Lunar Reconnaissance Orbiter (LRO) entered orbit to map the surface, its companion, the Lunar Crater Observation and Sensing Satellite (LCROSS), had a much more violent destiny: a planned impact at the Moon's south pole. The LRO and LCROSS spacecraft were co-manifested payloads on the same launch vehicle. The handoff between these two specific missions was scheduled to occur roughly two hours and ten minutes after liftoff.

The primary objective was to determine if water-ice existed in craters so deep they are permanently shadowed. On October 9, 2009, LCROSS and its Centaur upper stage impacted the lunar surface. This collision created a debris plume that allowed LCROSS to fly through the kicked-up material just four minutes later. The results were transformative: scientists confirmed that water exists in these shadows as mostly pure ice crystals. Furthermore, the mission revealed that the lunar soil is rich in useful materials and that the Moon possesses an active chemical cycle. This impact occurred in a crater that had been shielded from direct sunlight for billions of years. The satellite weighed approximately 1,369 pounds during its journey.

The mission's origins are tied to NASA’s human spaceflight Constellation program, which aimed to return humans to the Moon before being canceled. Though the program ended, LRO/LCROSS succeeded in testing modular subsystems for future use. By analyzing the debris plume from a 121 x 219,800-mile orbit, the mission proved that the Moon is not a geologically dead rock but a complex environment with a detectable water cycle. The Centaur upper stage reached a parking orbit measuring 112 by 129 miles before firing again to reach its final destination. This maneuver occurred at 22:15 UT on the night of the launch.

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