Chapter Questions
If you use a volleyball as a model of the Earth, how big would 1 kilometer be on it? The volleyball has a circumference of $68$ $\mathrm{cm}$.
What would be the circumference and diameter (circumference $=\pi \times \text { diameter })$ of a ball that would represent the Moon if the Earth were a volleyball? What kind of ball or object matches this size?
If the Earth were a volleyball, what would be the diameter of the Sun? What object matches this size?
If the Earth were a volleyball, how large would an astronomical unit be?
During the 1960 s and 1970 s, the Apollo spacecraft took humans to the Moon in three days. Traveling to Mars requires a trip of about 2 astronomical units in total. How long would this trip take, traveling at the same speed as to the Moon?
Using the same assumptions as in the previous question, how long would it take to travel to Pluto, about 40 astronomical units away?