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Vocabulary Preview

A Choose the correct word for each definition.

solar system axis core float solid
rotate exhibition simulator firsthand hydrogen

1. solid : a. hard or firm, with a fixed shape, and not a liquid or gas
2. simulator : n. a machine used to let people feel what real conditions are like
3. solar system : n. the sun and all the planets that go round it
4. hydrogen : n. a colorless gas that is the lightest element in the universe
5. float : v. to stay or move on the surface of a liquid without sinking
6. exhibition : n. a show of paintings or other objects that people can go to see
7. axis : n. the imaginary line around which a large round object turns
8. firsthand : a. learned or gained by doing something yourself
9. core : n. the central part of the Earth or any other planet
10. rotate : v. to turn with a circular movement

B Match each of the vocabulary words with the correct synonym.

Vocabulary Word Synonym

1. surround • • a. appearance, face, front

2. surface • • b. influence, impress

3. revolve • • c. circle, compass, enclose

4. pretend • • d. rotate, spin, circle

5. affect • • e. imagine, make believe

Unit 1 Astronomy 99