Across
- 4. First European to make regular observations of the heavens using a telescope
- 6. Confirmed that the sun was the center of the universe
- 7. A person who seeks wisdom or enlightenment
- 9. A system of thought expounded by René Descartes based on the belief that the reason is the chief source of knowledge
- 10. Created the "Universal Law of Gravitation"
Down
- 1. Sun-centered; the system of the universe in which the Earth and planets revolve around the sun
- 2. First to state that the universe was sun-centered
- 3. Earth-centered; a system of planetary motion in which the sun, moon and other planets revolve around the Earth
- 5. Any of the concentric, revolving, spherical transparent shells in which, according to ancient astronomy, the stars, sun and moon are set
- 8. English philosopher who believed that scientists should not rely on ideas of ancient authorities