The moon is one of the first things that the rocket will pass through because this is nearer to the earth as compared to the other planets and of course, the sun. The earth only has one moon but the other planets in the solar system may have a different number of moons.
For example, Uranus has 27 moons while Neptune has 14. There are some speculations that there might be changes that will occur to the solar system in the future. There is a possibility that the moons of these planets will crash and break into different pieces. This is not going to happen in the near future yet but there is a chance that this will happen.