If the universe was created in an explosion and the background microwave radiation was produced when the universe was young. Why did the radiation not overtake us much earlier? and why do we still see it?
If space is expanding everywhere then the space between and within two objects would be expanding. Could gravity be resistance to that movement? If the two objects maintain their distance apart the units of measure between them relative to the units of measure away from them would shrink. A person living on one of the objects would see space expanding as they look away from the other object whilst the other object would seem fixed in position. A person watching from another position in the expanding space away from the two objects would think that the two objects were moving closer together. Because space has three dimensions a linear expansion in one direction becomes an accelerating expansion when viewed in three dimensions. Eventually space would be expanding faster than the speed of light relative to the observer left behind leaving a sphere of space past which they could no longer see. For the person in the expanding space they would eventually reach a point where looking back the two objects would disappear when the light could no longer reach them.
Imagine two travellers being pushed out into the expanding space after the big bang. They initially are traveling parallel but as space expands they begin to move away from each other sideways. Like a missile fired into the sky their motion is slowed by gravity. As they look towards each other they see they are moving apart and as gravity reclaims them, to each other they seem to be moving apart at increasing velocity while in fact they are being pulled together. Is this what we see? and is the universe contracting while it seems to us that it is expanding at an increasing rate?
Imagine two people. One leaves Earth on a spaceship to travel at high speed around the solar system. When he returns he would be younger than the person that he left behind? In traveling he has travelled into the future whilst the person he left behind has travelled back in time? If time is a dimension does that mean that space has expanded in his travels for the person he left behind but not for him?