D4 - Exploring the Universe - Test

1. A massive star that explodes

• A. main sequence
• B. nebula
• C. supernova
• D. nova

2. A star that briefly becomes thousands of times brighter than normal

• A. main sequence
• B. nebula
• C. supernova
• D. nova

3. Dark cloud of gases and dust in space

• A. main sequence
• B. nebula
• C. supernova
• D. nova

4. Joining of the nuclei of atoms

• A. fusion
• B. gravity
• C. fiction
• D. brightness

5. Type of star accounting for 90% of the stars on the H-R diagram

• A. nova
• B. nebula
• C. fusion
• D. main sequence

6. A bright star may appear dimmer than a dim star because it is ________________.

• A. closer than the dim star
• B. farther away than the dim star
• C. hotter than the dim star
• D. smaller than the dim star

7. The ________ of a star determines how much gas it has.

• A. volume
• B. inertia
• C. mass
• D. brightness

8. The more mass a star has, the _________ it burns out.

• A. slower
• B. faster
• C. brighter
• D. dimmer

9. __________ causes part of nebulas to come together, forming dense centers called protostars.

• A. Darkness
• B. Fusion
• C. Gravity
• D. Sunlight

10. Absolute magnitude deals with _________.

• A. how bright the star appears to be
• B. the temperature of the star
• C. how far the star is from another star
• D. the actual brightness of the star