An Assessment

1. An Assessment • Best procedures: read quietly to yourself (so you don’t give any subconscious clues) • As the instructor, we read it too, for timing, then ask if anyone needs more time • If not, it’s time to vote simultaneously—use your fingers, right in front of your chest so others don’t see (anonymous) If the Sun were the size of a large pizza (40 cm), then Earth would be about as big as • A slice of pepperoni (about 5 cm) • A small piece of diced onion (about 0.5 cm) • A red pepper flake (about 0.5 mm) • A medium pizza (about 30 cm)

2. Another Arrange the following according to distance from Earth (from least to greatest): • Mercury, Saturn, the North Star, the Andromeda Galaxy • The North Star, Saturn, Mercury, Andromeda Galaxy • Saturn, Mercury, the North Star, the Andromeda Galaxy • Mercury, Saturn, the Andromeda Galaxy, the North Star • Two of these are the same distance

3. Which of these analogies works best? • Saturn: Solar System as electron: atom • Earth: Solar System as atomic nucleus: atom • Solar System: Galaxy as atom: proton • North Star: Solar System as neutron: atom • Mercury: Jupiter as electron: proton