Across
- 3. (force of attraction between objects)
- 5. (model of the solar system)
- 6. (model of the solar system with Earth at the center)
- 7. (period of major scientific advancements)
Down
- 1. (approach to scientific inquiry)
- 2. (German astronomer and mathematician)
- 3. (Italian scientist and astronomer)
- 4. (Polish astronomer)
- 8. (English scientist and mathematician)
- 9. (French philosopher and mathematician)