Item MO063004: If a student wants to make a model of the solar system to think about how long it would take a spaceship to travel between the planets, it is essential to accurately represent the relative sizes and distances, but it is not essential to make each model planet look like the planet it represents.
A student wants to make a simple model of the solar system to help him compare how long it would take for a spaceship to travel between different planets. Which of the following things is essential for him to do in order to think about how long it would take?

Distribution of Responses Percent of students responding correctly
 