1. Classify an unfamiliar object

Object X: It orbits the Sun, is made mostly of rock and ice, does not make its own light, is spherical, and has not cleared its orbital path.

Sentence starter: This is a __________ because it __________ and __________.

2. Mass and gravity

Sentence starters: More mass means __________ gravity. Gravity can pull a large object towards a __________ shape. Gravity can bend a moving object into an __________ and help a planet clear nearby __________.

3. Scale and Kepler’s evidence

Moon or planet → ____________________ → ____________________ → ____________________

Word bank: planetary system, galaxy, Universe

Path A: ◯    Label: ____________________

Path B: ⬭    Label: ____________________    Sun: ____________________

Sentence starter: Kepler’s observations supported the heliocentric model because ________________________________.