| 1. ________ formed from gas and dust particles remaining in the outer parts of the spinning nebula. | |
| a) | The sun | b) | Meteors | c) | Planets | d) | The solar system |
| 2. ______ formed from dense particles at the core of a spinning nebula. | |
| a) | Asteroids | b) | Planets | c) | The sun | d) | comets |
| 3. What is the eighth planet from the sun? | |
| a) | Uranus | b) | Neptune | c) | Saturn | d) | Jupiter |
| 4. Fusion takes places at the suns ______. | |
| a) | corona | b) | core | c) | photosphere | d) | chromosphere |
| 5. ________ is the planet closest to the sun in size. | |
| a) | Jupiter | b) | Mercury | c) | Earth | d) | Saturn |
| 6. Uranus as an axis tilted on its side and a core of _________ | |
| a) | hydrogen | b) | rock and ice | c) | methane | d) | ammonia |
| 7. The lagest planet in the solar system is _______. | |
| a) | Jupiter | b) | Earth | c) | Saturn | d) | Pluto |
| 8. A meteoroid that enters Earth's atmosphere and vaporizes is known as a(n) ______. | |
| a) | meteor | b) | meteorite | c) | comet | d) | asteroid |
| 9. The outer planet, ________, has features that are more like an inner planet. | |
| a) | Uranus | b) | Neptune | c) | Jupiter | d) | Pluto |
| 10. Saturn is surronded by a system of _________. | |
| a) | gases | b) | rings | c) | asteroids | d) | meteors |
| 11. A ____________ is an icy rock that travels in an orbit shaped like elongated ellipse. | |
| a) | meteor | b) | meteorite | c) | meteroid | d) | comet |
| 12. A(n) ________ is a meteor that reaches Earth's surface. | |
| a) | comet | b) | meteorite | c) | meteor | d) | asteroid |
| 13. A rocky object made of the same material from which the planets forms is called a(n) _____. | |
| a) | meteor | b) | meteorite | c) | meteoroid | d) | asteroid |
| 14. A cargo vehicle carrying supplies for the astronauts would be the first to go to Mars. | |
| a) | True | b) | False |
| 15. The inner planets include Earth, Mercury, Mars, and _____. | |
| a) | Jupiter | b) | Venus | c) | Saturn | d) | Uranus |
| 16. Mercury, the planet closest to the sun, has _______. | |
| a) | an atmosphere | b) | green aliens | c) | water vapor | d) | a large temperature range |
| 17. Because of the greenhouse effect, temperatures are very high on ____________. | |
| a) | Saturn | b) | Neptune | c) | Venus | d) | Pluto |
| 18. A cloud of gas and dust forms a(n) ____. | |
| a) | nebula | b) | Oort cloud | c) | Outer planets | d) | asteroid belt |
| 19. The outermost layer of the sun is known as a _________. | |
| a) | nova | b) | black hole | c) | super nove | d) | corona |
| 20. Magnetic disturbances of the suns surface are called ____________. | |
| a) | solar winds | b) | nebula | c) | corona | d) | sunspots |
| 21. The planets closer to the sun are made of __________ elements. | |
| a) | heavier | b) | lighter | c) | gaseous | d) | nitrous |
| 22. Earths atmosphere is made mostly of nitrogen and ________. | |
| a) | oxygen | b) | hydrogen | c) | sulfuric acid | d) | carbon dioxide |
| 23. CFCs destroy __________ | |
| a) | sunspots | b) | parallax | c) | chlorofluorocarbons | d) | ozone |
| 24. Scientists have discovered holes in the _______ above the Arctic and Antarctic regions. | |
| a) | corona | b) | chromosphere | c) | ozone layer | d) | CFCs |
| 25. Distances to nearby star measured by using ________. | |
| a) | magnitude | b) | H-R diagrams | c) | parallax | d) | luminosity |