Across
- 1. Sequence The stage in which stars produce energy through the fusion of hydrogen into helium
- 4. When stars form inside a cloud of gas and dust
- 6. Huge loops of glowing gas that extend into the corona
- 7. spots on the photosphere of the Sun
- 8. The thin middle layer of the sun
- 10. zone Energy from the core moves to this area
- 13. The transfer of energy from place to place by the motion of heated gas
- 14. Galaxies The Milky Way is an example of this type of galaxy
- 17. The center of the sun
- 18. The distance light travels in a year
- 20. Eruptions of gas from the suns surface
Down
- 2. The thing that protects Earth from craters and space debris
- 3. Hole The result of a supernova
- 5. Unit The unit used to measure distance between two planets
- 9. Part of the sun you can see
- 11. Earths most valuable source of energy
- 12. Wind Electrically charged particles that flow out in all directions from the corona
- 15. When hydrogen particles collide and form helium
- 16. A space object that reaches Earth
- 19. Way Galaxy Galaxy that we live in