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Japan’s private lunar lander Hakuto-R crashed during a landing attempt in late April when an onboard altitude sensor became confused by the edge of a lunar crater.

Representatives from the Tokyo-based ISpace company, which built the rover, said the unexpected terrain caused the lander’s computer to determine that the altitude measurement was wrong and instead based it on the mission’s expected altitude. As a result, the computer was convinced that the test was less than correct, which led to The crash On April 25.