Across
- 2. The theory that the earth is the center of the universe and that the sun and the other 7 planets revolve around it
- 3. The 3rd planet from the sun and the only known planet to have life.
- 5. The first to come up with the heliocentric theory.
- 6. An Italian astronomer who was the first to use the telescope to study the stars
- 8. The study of the stars
- 9. A celestial body made of either rock or gas that orbits a star.
- 10. A subject that many astronomers used to help discover more about our solar system (Isasc Newton invented a type of it)
Down
- 1. A plan for collecting, organizing, and communicating data.
- 4. The theory that the planets revolve around the sun
- 7. The invisible force that pulls everything to the surface of the earth
