Across
- 2. pluto is the most famous of these types of planets
- 3. also known as the big bear
- 5. orbiting companion of a planet
- 7. what people call "shooting stars"
- 8. a small body made up of rocky material and ice
- 10. this astronomer made the discovery that gravity affects all celestial bodies
Down
- 1. a natural body out in space
- 4. range from the size of sand grains to about 1000km across
- 6. Ptolemy used this tool to observe constellations
- 9. planets move in ________ orbits