Are objects in space moving apart at an increasing rate relative to one another, or is the 'space' between them expanding? For example, using red-shift to explain the differential causes: If an object is moving away from Earth, the electromagnetic waves it emits are red-shifted. This would be because the initial standardised wavlength for the emission in question is preset, given, if you will, but in addition to this, you have the velocity of the celestial object, thus adding a two-point dependancy to the given wavelength - that is, if the objects are moving apart relative to one another. But what if the force we imagine to be propelling these objects apart is in fact non-existant? If the reason for the increasing rate of expansion of the universe is down to space expanding, then red-shift would still occur. To imagine the expansion of 'nothing' is a difficult concept to imagine, but it would be clearer as to why the rate of expansion is accelerating - Hubble's Law clearly relates distance with the rate of expansion, but what is causing the accelerating rate of which the universe is expanding? For eample, if you had 4 cubic metres of 'space', and the amount of 'space' doubled every minute, then after one minute you would have 8 cubic metres, then after two, you would have 16 cubic metres, and so on - directly demonstrating the relationship between time and 'space', so to speak. I have many more questions, but I would be interested to hearyour views on what I have written so far.