On April 18, 2014 (March 19, 2014 in the lunar calendar), the self-destruction parts of the U.S. lunar probe collided with the moon at high speed due to high temperatures. The US Lunar Atmosphere and Dust Environment Explorer (LADEE) failed to capture its final journey due to fuel exhaustion. According to information released by NASA, the vending machine-sized lunar orbiter fell and disintegrated on the lunar surface between 0:30 and 1:22 EDT on April 18, 2014 (12:30 and 13:22 Beijing Time), many of its parts vaporized due to the high temperatures generated during the impact. Project scientist Rick Aifik said: "The impact speed of the Lunar Atmosphere and Dust Environment Detector reaches 3600 miles per hour (about 5800 kilometers), which is about three times the speed of high-energy rifle bullets. There is nothing 'gentleness' about colliding at this speed. The question is simply whether it created a pothole in the hillside or whether the debris was scattered on a flat lunar surface." The Lunar Atmosphere and Dust Environment Probe was launched in September last year and entered lunar orbit a month later. The mission of the flight: testing a broadband communication system between the earth and the moon; Analyze the moon's thin atmosphere; investigate the cause of the mysterious brilliance seen by Apollo astronauts on the lunar horizon before sunrise. The probe's main mission ended in March this year. Because there was little fuel needed to continue flying and it could not return to Earth, NASA consciously let the probe crash into the back of the moon. It is far away from all previous impact sites and cannot be observed from Earth. On April 11, ground controllers conducted the last orbital maneuver of the probe. However, due to the very uneven lunar gravitational field, NASA estimated the impact time at that time to be some time on or before the 21st of this month. NASA said that in the next few months, ground controllers will use another U.S. probe, the Lunar Reconnaissance Orbiter, to find the impact site of the Lunar Atmosphere and Dust Environment Detector to determine the specific impact time. Data: The Lunar Atmosphere and Dust Environment Detector tracked the Chang'e-3 during the landing of Chang'e-3. NASA's Lunar Atmosphere and Dust Environment Detector, Lunar Reconnaissance Orbiter and ARTEMIS Detector tracked the Chang'e-3 landing process. Among them, the Lunar Atmosphere and Dust Environment Detector is responsible for investigating the impact of Chang'e-3 on the dust environment around the near-moon during the landing process. The high-sensitivity instrument it carries can detect minor changes.