Across
- 3. pluto is now classiffied as a _____
- 7. not weight, but ___; same on all planets, quantity of matter
- 9. the only thing other than earth humans have landed on
- 10. the sun is also a ___
- 11. most common theory on the origin of the universe
- 13. the Milky Way, for example
- 15. a number which scales, or multiplies, some quantity
- 16. either natural or artificial, orbits object in space
- 18. all of space and time and its contents as we know it
- 19. to circle around a larger object (in space)
- 20. 365 days of travel at light speed
Down
- 1. Earth is our
- 2. Earth perceived as the center (not heliocentric but _)
- 4. science of space
- 5. magnifies,observes space/makes distant objects clear
- 6. the things that surround and orbit the Sun
- 8. not elliptical or irregular, rather ____
- 12. often described as having a tail, hurtles through space
- 14. the earth spins on it's __
- 17. Einsteins Theory of ____ was a major step in physics