Ok, this Hubble thing has me a bit puzzled, with the galaxies all moving away from each other like currents in a pudding as the mix expands, the further away, the faster they recede. I suppose space could be considered the expanding pudding mix, but a small metal ruler in an expanding pudding mix would stay the same length as the pudding mix expands (Ignoring thermal effects on the ruler) Now, as a thought experiment, imagine a tape measure tethered to the Earth extending to a distant galaxy which is moving away from us at half the speed of light. (1) Does the tape measure stay the same length despite the expanding space it is in & the galaxy travels away from the end of the measure at half the speed of light? (2) Does the tape measure expand with the space & keep up with the galaxy? If so, surely the atoms in the tape measure would become separated? What would happen then? It might be easier to imagine the effects on a thick steel rod, how is it effected by expanding space? After all, surely there is space between & within the atoms which will expand too? Would the atoms lose their grip on each other? Any insight into this would be greatly appreciated.