2. Why does Sagan say that Mars is a more desirable target for human exploration than the moon?
(a) It is more inhabitable.
(b) It is more like Earth.
(c) It has more to teach.
(d) It has more resources.

3. What types of information does SETI analyze?
(a) Magnetic waves.
(b) Cosmic rays.
(c) Radio waves.
(d) Gravitational waves.

4. Why do some suggest capturing asteroids in Earth orbit?
(a) To use them as space stations.
(b) To use them as weapons.
(c) To mine them for resources.
(d) To study them.

5. What hazard from nuclear weapons causes "nuclear winter"?
(a) The erosion of land after plant life is wiped out.
(b) Smoke particles in the upper atmosphere.
(c) Acid rain.
(d) Cloud scattering.

6. Sagan describes the "myth" that he believes should be created as centering around what?
(a) Encouragement.
(b) Science.
(c) Tolerance.
(d) Discovery.

7. What was the name of the second mission that sent probes into the atmosphere of Venus?
(a) Brahe.
(b) Kepler.
(c) Hubble.
(d) Mariner.

8. What is the farthest orbital location that humans have ventured to since the last time men went to the moon?
(a) Geosynchronous orbit.
(b) Parking orbit.
(c) High Earth orbit.
(d) Low Earth orbit.

9. What characteristic of the atmosphere of Venus was initially impossible to explain?
(a) Its dark spots.
(b) Its composition.
(c) Its heat.
(d) Its high winds.

10. What is the shape of the galaxy closest to the Milky Way?
(a) Disc.
(b) Spiral.
(c) Cluster.
(d) Globular.

11. How does Sagan characterize most of the benefits gleaned from the space programs of the 60s and 70s?
(a) They were underestimated.
(b) They were relatively unimportant.
(c) They were unexpected.
(d) They were intangible.

12. Sagan estimates that intelligent life might arise on average in one out of how many stars?
(a) One million.
(b) Ten thousand.
(c) One billion.
(d) One trillion.

13. How are chunks of Martian rock studied on Earth?
(a) They are returned by two-way probes.
(b) They fall to the Earth.
(c) They are simulated with moon rocks.
(d) They are captured in space.

14. Sagan worries about how societies of what type would handle the technology that could stop Earth-bound asteroids?
(a) Progressive.
(b) Totalitarian.
(c) Socialist.
(d) Liberal.

15. How old are the terrain features generated by Venus' volcanoes?
(a) 500 million years.
(b) 2 billion years.
(c) 4 billion years.
(d) 1 billion years.