Confused about space expansion?? Me too. Space expansion is occurring from what we can observe. In another thread about gravity i read that gravity is space time essentially, as if you introduced an object into earth's atmosphere it would instantly be subjected to earth's gravity as it would instantly be in space time, and that gravity waves would travel along space time should the earth be split in 2 thus the object not instantly feeling the change in gravity, but would be affected once it felt 'waves'. Now, what are these waves?? Is it a ripple of space time, or a ripple of gravity?? Or is gravity in fact space time, and any change in gravity causes a ripple of space time?? Now i need to understand this as a precursor to my next questions about space expansion. Can space time expand of it's own doing, or does it need gravitational force of seperate bodies of mass moving away from each other, in order to be expanded?? I understand on a basic level how gravity can cause distortion to space time, by the movement of mass. But i can't understand the reversal of this process where space time can cause the movement of mass. Yet essentially if space expansion is the 'cause' of distant recessional bodies that are observed, it is not the mass of the bodies moving causing expansion, but the expansion moving the bodies, so what is the actual force causing this mass to move?? Also, has space expansion been observed on anything of a smaller scale, whereby distance has increased between 2 objects because the space expanded?? why does not everything get bigger?? On a tangent to this topic, recessional bodies that were >c can now be observed because they are no longer travelling >c. this would indicate reduction in speed. what is the cause of this reduction? Now if space time is gravity, and can expand, then gravity is not related to mass, as space time(gravity) has expanded yet the mass has remaind the same. Please you demons of knowledge HELP!!!