Across
- 6. Property of planetary matter measured in grams
- 8. Speed of an object in a given direction
- 9. Dark patches that temporarily appear on the sun
- 10. Change in an object's speed or direction
- 11. Scientist who published laws of physical motion
- 15. Body that orbits a more massive object
- 17. Tool used by scientists to observe distant stars
- 18. Computer program modeling collisions and space events
- 20. Cloud of dust and gas forming planets
Down
- 1. Scientist who proposed original nebular hypothesis model
- 2. Property combining with gravity to form rings or resist changes in motion state
- 3. Flattened spinning cloud shape around young sun
- 4. Path of planets or bodies moving around a object in space
- 5. Force that pulls particles, planets, and matter together universally
- 7. Mathematician who refined the spinning cloud model
- 12. Rocky inner planets like Earth and Mars
- 13. Object that is launched or thrown forward
- 14. Layer composed of hydrogen surrounding gas giants
- 16. Bodies formed from colliding clumps in rings
- 19. International array composed of sixty-six radio dishes