Apollo

Eugene Cernan/NASA

In July,1969, NASA first landed men on the Moon, attaining humanity’s first ever visit to another world.

The Tidal Dance of the Earth and the Moon

We learn in grade school that the Moon, our nearest neighbor in space, causes tides on the Earth’s oceans. It does so through its gravitational attraction to the Earth. But the gravitation interplay between Earth and Moon has other, subtler effects as well.