The prevailing belief is that the Moon was formed in a violent event between Proto-Earth, an early stage Earth that was much larger than it is now.
Computer calculations estimate the Moon was 12-19 times closer at 20,000-30,000km, compared to 384,000km now.
Apollo 17 astronaut Harrison ‘Jack' Schmitt compared the scent to gunpowder. The dust gave astronauts "lunar hay fever.
NASA says the Moon's temperature ranges from 123 to -233 Celsius. Its daytime surface temperature is 107 degrees Celsius and nighttime -153 degrees Celsius.
Earth has 190 impact craters, many buried by water and plants, whereas the Moon has millions, including 5000 bigger than 20km.
The Moon spins around its axis like Earth, but since it takes 27 days to rotate, the same as the 27.32 days it takes to circle the Earth, you only see one side.
Essentially the Moon pushes the water up on one side of the Earth, but when its gravitational pull is less, the water moves up in the other direction.