Across
- 4. A star that is among the most massive and brightest of all stars
- 7. A dead star that no longer gives off light or heat
- 8. Same hours during day and night
- 9. The extremely dense remains of a dead star
- 11. A gravitational field so strong that not even light can escape
- 12. A huge cloud of dust and gas held together by gravity
- 13. Days the Sun is highest or lowest in the sky
- 17. The spinning of an object on its axis
- 19. A star that is larger and brighter than a main sequence star
- 20. Spring, Summer, Fall, Winter
Down
- 1. A star that has exhausted all of its nuclear fuel
- 2. A young star in the early stages of formation
- 3. A ring-shaped nebula formed by an expanding shell of gas around an aging star
- 5. An extremely bright explosion of a star
- 6. 90% of stars are in this stage of their life cycle
- 10. The process that allows a star to give off light and heat
- 14. the path that 1 object in space takes around another object in space
- 15. A sloping position
- 16. One complete orbit made by a planet
- 18. An imaginary line that goes around the planet