Pale Blue Dot: A Vision of the Human Future in Space Test | Final Test - Hard

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This test consists of 5 short answer questions, 10 short essay questions, and 1 (of 3) essay topics.

Short Answer Questions

1. About how large a percentage of the mass of the total universe does dark matter make up?

2. What hazard from nuclear weapons causes "nuclear winter"?

3. Why does Sagan say that Mars is a more desirable target for human exploration than the moon?

4. What did Steven Hawking worry about with regard to black holes?

5. What is the primary way that humans add carbon dioxide to the atmosphere?

Short Essay Questions

1. What does Sagan say that it is probably the fate of humanity to "live in the dark"?

2. What location in the solar system either have or are believed to have once had volcanoes?

3. What does Sagan believe black holes have to offer?

4. What resources does Sagan believe that carbon asteroids have that make them suitable for human habitation?

5. What would the process of "terraforming" on Mars be like?

6. How does Sagan believe that humanity will progress in the next hundred or so generations?

7. What is the purpose of SETI and how does it operate?

8. What does Sagan want to see on Mars?

9. How is Venus different from Earth?

10. Why does Sagan believe that America sent men to the moon?

Essay Topics

Write an essay for ONE of the following topics:

Essay Topic 1

Uranus was the first new planet discovered, aside from the five known to ancient cultures.

1) Discus the discovery of Uranus and what made this discovery unusual and unique.

2) Describe the planet Uranus, including a discussion of its unique inclination and theories to explain this feature.

3) Discuss Sagan's impression of the planet and the likelihood that it or its moons could harbor life.

Essay Topic 2

Saturn is known for its beautiful ring system, although at the time this book was written, it was not known how or why planets formed rings.

1) Describe the planet Saturn, its ring system, and its moons.

2) Summarize some of the important information that the Voyager probes gleaned from their passage of the planet.

3) Discuss how planetary tidal forces are believed to contribute to the formation of ring systems.

Essay Topic 3

Sagan presents a thought experiment in Chapter 5, "Is There Intelligent Life on Earth?" He suggests that the observations that a visiting alien might make of Earth would not necessarily reveal the presence of intelligent life.

1) Discuss the thought experiment that Sagan proposes in Chapter 5, and describe the obvious characteristics of the Earth from the perspective of this visitor.

2) Describe the types of observations a visitor to Earth would have to make in order to determine the presence of intelligent life on the planet.

3) Explain how this thought experiment demonstrates Sagan's point about "missing" important details in the search for life in the solar system.

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