Across
- 1. comes from moon's orbit of Earth
- 4. 4 moons of Jupiter finder
- 8. collected 30 years of data
- 9. one day is equal to
- 10. 3.26 light years
- 11. the weakest fundamental force
- 13. type of eclipse where moon is blocked out
- 15. shape of planetary orbits
- 16. shift shows that galaxies are moving away
- 17. catalogued over 100 objects in galaxy
- 18. a type of useful on earth
- 20. type of eclipse when moon blocks sun
- 21. his equation has to do with life elsewhere
Down
- 2. his constant explains universe expansion
- 3. how long a revolution around the sun takes
- 5. small circles used to explain retrograde motion
- 6. a galaxy shape
- 7. effect of changing frequencies by movement
- 12. created laws of planetary motion
- 14. laws of motion creator
- 17. what a reflecting telescope uses
- 19. type of matter we can not see