Across
- 4. icy body that develops a tail near a star
- 5. nuclear reaction powering stars
- 6. dense center of a planet or star
- 8. region around a planet controlled by its magnetic field
- 10. gas cooling to form solid or liquid particles
- 13. paths of planets and bodies around stars
- 14. small solid objects from which planets form
- 15. flattened rotating structure of gas/dust around a star
- 16. collision between bodies in space
Down
- 1. growth of a body by gathering matter
- 2. separation of materials by density inside a planet
- 3. planet outside our solar system
- 7. small rocky body in space
- 9. early stage of a star’s formation
- 11. cloud of gas and dust in space
- 12. force pulling matter together