As a distant object moves further and further away, its apparent size decreases. This is because the object's visual angle -- the angle that is created between two lines from the observer's eye to the opposite edges of the object -- becomes smaller as the object recedes. Additionally, as the object moves away, the amount of light from it that reaches the observer's eyes also diminishes. This causes the object to appear fainter and less distinct. Furthermore, if the object is moving at a high speed, it can appear distorted due to the effects of motion blur. Finally, as an object moves away, the amount of atmospheric interference between the observer and the object increases, which can further affect its appearance.