It is not. The difficulty is that, mainly, we don't know lots of the variables there; and at the time the US was in a race to do it. But the moon is just a regu

It is not. The difficulty is that, mainly, we don't know lots of the variables there; and at the time the US was in a race to do it. But the moon is just a regular small planet that is much easier to escape its gravity than earth.