And it could shed light on remaining mysteries, such as why the crust on the far side of the Moon is thicker than that on the near side.

BBC: Nasa reveals new information about moon probes crash sites

But the size of the Earth is a few percent of the distance to the moon, which translates to about a 7% stronger gravitational pull on the near side of the Earth than the far side.

CNN: The sun, the moon and the Titanic

One theory for the difference between the Moon's far side and near side is an ancient collision with a second natural satellite of Earth.

BBC: Nasa reveals new information about moon probes crash sites