Why were you instructed to multiply the distance in an AU by 40 to determine how long your scale model needed to be?

Multiplying the distance in astronomical units (AU) by 40 to determine the length of a scale model is a method to create a more manageable representation of vast astronomical distances. Since 1 AU is approximately 93 million miles, scaling it down by a factor of 40 makes it easier to visualize and construct models while still maintaining a proportional relationship. This method allows for a tangible understanding of distances in the solar system without requiring impractically large models.