It must be wrong to think of gravitons like air molecules that have the free space to move in any direction, because if a wave of gravitons could move side to side, they could effectively ‘miss’ attracting some small particles. So they must behave like a complete solid wall of particles. But then as the waves move further away from their source, they must split up/stretch out and so the gravitons have gaps between them? Also, is there anything in general relativity that says gravity does not stretch out infinitely? If gravity is space curving (curved geometry) then the geometry must have a start/end for the curve to begin and end?