Lesson 1&2 Vocabulary

4. a streak of light in the sky made by the burning of a meteoroid in Earth's atmosphere
8. a model of the universe in which Earth and the other planets revolve around the sun
10. an oval shape, which may be elongated or nearly circular; the shape of the planets’ orbits.
13. the scientific law that states that every object in the universe attracts every other object.
15. a loose collection of ice and dust that orbits the sun
16. the tendency of an object to resist a change in motion
18. the path of an object as it revolves around another object in space

1. either of the two days of the year on which the sun reaches its greatest distance north or south of the equator
2. a pattern of stars that people imagine to represent a figure or object
3. The spinning motion of a planet on its axis.
5. a model of the universe in which Earth is at the center of the revolving planets and stars
6. an object that orbits a planet
7. the movement of an object around another object.
9. either of the two days of the year on which neither hemisphere is titled toward or away from the sun.
11. an object that orbits a star; Earth
12. the attractive force between objects; the force that moves objects downhill
14. a ball of hot gas that undergoes nuclear fusion; the sun
17. an imaginary line that passes through a planet’s center and its north and south poles, about which the planet rotates.