Unit 5 Astronomy Review

2. The moon phase that a spring tide occurs.
5. galaxy that contains middle-aged stars and very rich in gas and dust.
6. A star's position on the H-R diagram is determined by its temperature and this.
7. The change in the position of ocean water caused by the Moon's gravitational pull.
8. The tide that has minimal change to its high and low tide.
10. universe began as a point and is continuously expanding.
11. the life cycle of a star depend on its _____.
14. The life cycle phase when a star fuses hydrogen into helium. Our Sun is currently in this stage.
15. The force that attracts objects toward each other, like the force that keeps the planets in orbit.
16. the hottest and dimmest stars on an H-R Diagram.
17. A large ball of gas that produces light and heat from nuclear reactions.
18. The spinning of a planet on its axis.

1. The movement of one object around another, like Earth's orbit around the Sun.
3. The path that a planet follows around a star.
4. A diagram that shows the relationship between the luminosity and temperature of stars.
5. The four main divisions of the year caused by Earth's tilt and orbit around the Sun.
6. The process by which a star is born, lives, and dies.
9. the moon and sun's ____ pull is responsible for the tides.
12. the season when the north hemisphere is tilted towards the Sun.
13. The name of our galaxy.