Across
- 5. gradual growth of bodies
- 8. chunk of debris landed on Earth
- 10. outer atmosphere of the Sun
- 11. to shrink
- 12. point farthest from the Sun
- 14. presence of a magnetic sphere
- 16. orbits between Mars and Jupiter
- 17. to grow
- 18. central region of a planet
- 19. studies everything in the universe
Down
- 1. solidified lava
- 2. central region of a shadow
- 3. cloud of gas and dust
- 4. natural satellite of a planet
- 6. chunk of debris entered Earth's atmosphere
- 7. brightest part of a comet
- 9. vernal and autumnal
- 13. event when two bodies pass each other
- 15. crater that forms on top of a volcano
- 18. high level Earth clouds