Why is a scale model of a system helpful to scientists? 1: Scales models while not an accurate measure for relative size, help to understand distance.

2: Scale models help to understand why moons fall into orbit around planets.

3: Scale models help to understand for relative sizes and distances of planets in actual system.

4: Scale models, while not accurate in measure for relative distance, help to understand size.

P. S: Please answer this as simple as possible.