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Apollo 10's Lunar Module flies within 8.4 nautical miles (16 km) of the Moon's surface.
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Apollo 10
Second crewed mission to orbit the Moon
Apollo 10 was the fourth human spaceflight in the United States' Apollo program and the second to orbit the Moon. NASA, the mission's operator, described it as a "dress rehearsal" for the first Moon landing. It was designated an "F" mission, intended to test all spacecraft…Source: Wikipedia (CC BY-SA)
Apollo Lunar Module
NASA crewed Moon landing spacecraft (1969–1972)
The Apollo Lunar Module, originally designated the Lunar Excursion Module (LEM), was the lunar lander spacecraft that was flown between lunar orbit and the Moon's surface during the United States' Apollo program. It was the first crewed spacecraft to operate exclusively in…Source: Wikipedia (CC BY-SA)
Nautical mile
Unit of distance (1,852 m)
A nautical mile is a unit of length used in air, marine, and space navigation, and for the definition of territorial waters. Historically, it was defined as the meridian arc length corresponding to one minute of latitude at the equator, so that Earth's polar circumference is…Source: Wikipedia (CC BY-SA)
Moon
Natural satellite orbiting Earth
The Moon is Earth's only natural satellite. It orbits around Earth at an average distance of 384,399 kilometres (238,854 mi); about 30 times Earth's diameter. Its orbital period and its rotation period are synchronized at 29.5 days by Earth's gravity pulling on the Moon. This…Source: Wikipedia (CC BY-SA)