I was reading Paralel worlds by Michio Kaku, due to its content I'm hoping to learn a little more about physics and cosmology, before i go to university, at one certain point, right in the beggining, while explaining Einstein's view on gravity, the author says that for Einstein, the Earth moves around the Sun because of the deformation caused by the Sun on space causing the idea of a gravitic force rather than an actual force. So, if gravity is a product of the space-time disturbances, how does the Earth's gravity appears? And if the sun disturbs space like a bowling ball on a matress how can there be several bodies orbiting the sun? And why dont these bodies fall to the sun is it because they deform space the same way the sun does reversing what the sun does? Also, why do comets have much more eliptical orbits than the planets if the sun disturbance on space is even? Sorry for the long post, for the bad and confusing english, and feel free to correct the errors when you find them. Thank you in advance.