To determine the maximum possible distance between Mars and Neptune on a scale model, we need to consider the actual average distance between these two planets in the solar system.
Mars is, on average, about 227.9 million kilometers from the Sun, while Neptune is about 4.5 billion kilometers away. The distance between Mars and Neptune can vary significantly based on where they are in their respective orbits, but on average, it can be approximately 4.3 billion kilometers.
If we want to express that in a scale model, we can select a scale. However, the maximum distance in the provided options could refer to a scenario when both planets are on opposite sides from the Sun.
From the given options (28.5 cm, 570 cm, 1.5 cm, 630 cm), 570 cm and 630 cm are the only likely candidates as they imply a significant distance in the model. The actual scale and context are needed to determine which option is correct without further information.
If we are to give an answer based only on the maximum possible distance, 630 cm seems to be the most reasonable response. However, without knowing the specific scale being used, it's difficult to conclude definitively.