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If humans return to the Moon, they will need good maps. Luckily, one plucky little spacecraft has been making them. For the past seven years, the Lunar Reconnaissance Orbiter (LRO) has been painstakingly photographing almost all of the Moon’s surface. But the mission has not always gone to plan.

If you read scientific reports closely, you will come across words such as error and uncertainty. What do they mean? If a teacher tells you that you made an error on a test, then you got something wrong. In everyday language, that’s what error often means – a mistake.