Across
- 3. Caused by movement of a source towards the observer
- 5. Full shadow
- 8. Thick belt of asteroids that lies past Pluto
- 9. Directly between the Zenith and the Horizon
- 10. Gave us the most precise observations of planetary motion
- 12. Not the same as weight (does not change with gravity)
- 13. Galaxy we will collide with in about 4.5 billion years
- 15. Planet with the "red spot"
- 18. Milky Way galaxy type
- 19. Less Full (Lunar)
- 20. Light _____ acts as both a particle and a wave
Down
- 1. Super massive thing that lies in the center of the Milky Way
- 2. How an object appears to be green if it absorbs red and blue light
- 4. Moon goes through phases over 29.5 days
- 6. Sun's projected path through the constellations
- 7. What an objects color is if it absorbs only red and blue light
- 11. Caused by movement of a source away from the observer
- 12. Earth's only natural satellite
- 14. Fourth planet from the sun
- 16. Fuller (Lunar)
- 17. Cluster of stars and solar systems