Stars And Galaxies Answer Key Worksheet

Stars and Galaxies Answer Key

1. The three types of galaxies are spiral, ________.

b. elliptical, and irregular

2. When a massive star explodes in a supernova, it can create ________.

a. a nebula

3. Stars are born in ________.

c. nebulae

4. Stars produce energy through ________.

a. nuclear fusion

5. Galaxies are usually about ________ light years across.

c. 1,000–1,000,000

6. The Milky Way is ________ light years across.

b. 100,000

7. The Milky Way contains about ________ stars.

c. 100 billion

8. A black hole is ________.

a. a massive star that used up its fuel and collapsed

9. Scientists estimate that the Big Bang occurred ________.

b. 15 billion years ago

10. It takes light from the Sun ________ to reach Earth.

c. 8 1/2 minutes

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