Stars

1. the death explosion of a massive star
4. a star that’s between a giant planet and a small star in size
9. a star near the end of its life when most of its fuel has been used up
10. an object is moving towards the observer
12. a space where gravity is so strong that nothing, not even light, can escape
16. a very young star that is still forming
17. the theory that suggests that the universe was formed in a single point in space 18 billion years ago
19. a huge system containing billions of start, gas, and dust
20. a star who’s fuel begins to exhaust and expands to about fifty times its normal size
21. the process by which dense regions of gas and dust collapse to form a star

2. a cloud of dust and gas in space
3. an icy object that forms a glowing tail when it approaches the Sun
5. happens when an object is moving away
6. a large object that orbits a star and does not produce its own light
7. a small and relatively cool star
8. a very small, white star that is the remnant core of a star that has completed fusion in its core
11. the distance light can travel in a year
13. a small rocky object orbiting the Sun
14. a massive ball of hot gas that produces nuclear fusion
15. the largest and most luminous types of stars
18. the forse that pulls gas and dust together to start the formation of a star