Topic 11 Vocab

1. write the definition for law of universal gravitation
4. term describing a model of the solar system in which Earth and the other planets revolve around the sun
7. a ball of hot gas, primarily hydrogen and helium, that undergoes nuclear fusion
9. one of the different apparent shapes of the moon as seen from Earth
11. an oval shape, which may be elongated or nearly circular; the shape of the planets' orbits
12. a loose collection of ice and dust that orbits the sun, typically in a long, narrow orbit
13. the partial or total blocking of one object in space by another
15. either of the two days of the year on which neither
19. an object that orbits the sun, is large enough to have become rounded by its own gravity, and has cleared the area of its orbit
21. the periodic rise and fall of the level of water in the ocean
22. the darkest part of a shadow
23. a pattern or grouping of stars that people imagine to represent a figure or object
24. the attractive force between objects; the force that moves objects downhill.

2. tide with the greatest difference between consecutive low and high tides
3. term describing a model of the universe in which Earth is at the center of the revolving planets and stars
5. tide with the least difference between consecutive low and high tides
6. the movement of an object around another object
7. either of the two days of the year on which the sun reaches its greatest distance north or south of the equator
8. an imaginary line that passes through a planet's center and its north and south poles, about which the planet rotates
10. a streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere
14. the spinning motion of a planet on its axis
16. the part of a shadow surrounding the darkest part
17. the tendency of an object to resist a change in motion
18. an object that orbits a planet
20. the path of an object as it revolves around another object in space