Why do specific object movement is conditioned by the gravity force? Why the moon is pulled by Earth and doesn`t move freely? Why the planets don`t move in different way but obey to the gravitacional force of Sun? Everybody knows that Earth moves around the sun for 1 year and travels for hundreds of kilometres.The moon moves together with the Earth in this 1 year trip. What is the force that comands the Moon to stay with earth and don`t leave it? And does the gravitacional force of Sun affect Moon as same as it affects Earth? Moon and Earth pull each-other and move under the affect of gravity of Sun . Is there a force that keeps them in a specific distance from each-other or they will pull each-other for a long time until they maybe crash? I think gravity of Sun made Moon come closer to Earth and than caused this year catrastophy in Japan?