Changes

==Observations and calculations==

==Observations and calculations==

For a long time, these three models had been accepted as possible lunar origins. However, later research gave a number of points that spoke against them.

For a long time, these three models had been accepted as describing possible lunar origins. However, later research was to produce evidence that worked against them.

After the Apollo program, rock samples taken from the Moon revealed two important things:

After the Apollo program, rock samples taken from the Moon revealed two important things:

#The Moon lacks iron. This is important to note because the Earth, in comparison, has a lot of it (in the core).

#The Moon lacks iron. This is important to note because the Earth, in comparison, has a lot of it (in the core).