Across
- 3. the study of objects beyond Earth and how they interact
- 4. oval shape of planetary orbit
- 5. an object that orbits a star but has not cleared the path of other objects
- 8. a.k.a. longitude
- 9. a science rule that has never been disproven
- 13. the distance from the Earth to the Sun
- 14. the distance light travels in one year
- 16. the movement of one object around another
- 17. the unit of distance most used by astronomers
Down
- 1. patterns seen in groups of stars in the sky
- 2. a collection of dust, gas, stars & planets
- 4. invented to try to explain retrograde motion
- 6. Greek who calculated the radius of the Earth
- 7. belief that the Earth is the center of everything
- 10. giant balls of hot plasma that give off radiation
- 11. the point in the sky directly overhead
- 12. how high an object is above the horizon
- 15. the direction pointed in the sky measured in degrees