Across
- 5. collection of gas/dust
- 7. crash to earth
- 11. mercury,venus,earth,mars
- 13. changing direction of earth axis
- 15. jupiter,saturn,uranus,neptune
- 16. smaller piece of rock and metal
- 17. study of the universe
- 19. stellar explosion at end of stars life
Down
- 1. chunk of ice,dust and rock
- 2. plants like pluto,haumea,makemake
- 3. revolves around earth
- 4. composed of rock and metal
- 6. cloud of gas and dust
- 8. burn in earths atmosphere
- 9. hottest part of sun
- 10. study of objects beyond earth
- 12. revolves around sun
- 14. dark surface spots that are cooler than surrounding area
- 18. produces their own light