The Moon is moving away from Earth at a rate of about three centimeters per year.
Why it is true
The tidal interaction between Earth and the Moon transfers energy, causing the lunar orbit to gradually expand. This phenomenon has been precisely measured using laser reflectors left by astronauts.
Source: Lunar Institute
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.