Across
- 3. a small planet that revolves around the sun
- 5. the amount of space matter takes up
- 6. the amount of matter in an object
- 9. a large, self-contained mass of stars
- 12. how many outer planets there are
- 13. a tool that makes distant objects appear closer
- 14. an object moving clockwise in space, instead of counter-clockwise
- 16. separates the inner and outer planets
- 18. the closest planet to the sun
- 19. a representation of proportionate size
- 20. a celestial body moving around the sun made up of dust and gases
Down
- 1. the amount of attraction, or pull, an object has
- 2. a natural or man-made object that orbits around a planet
- 4. how many inner planets there are
- 7. the sun together with all of the planets and other bodies that revolve around it
- 8. an object in the sky that produces its own light
- 10. the largest planet in our solar system
- 11. any natural object that can be seen in our sky
- 15. an object that orbits a star and doesn't produce light
- 17. the amount of space between two things