天文学 TPO22-L2 Faint Young Sun Paradox

TPO22-L2

Faint Young Sun Paradox

Listen to part of a lecture in an astronomy class.

 



  1. What is the main propose of the lecture?
  • A. To compare solutions to the greenhouse-gas problem.
  • B. To examine methods used to study star formation in other solar systems.
  • C. To discuss evidence for liquid water on young Earth and Mars.
  • D. To discuss attempts to solve a puzzle related to the Sun.

 

  1. Why is geological evidence of liquid water on Earth and Mars three to four billion years ago problematic?
  • A. It suggests that the solar system is younger than it could possibly be.
  • B. It suggests that the young Sun was less bright than it is today.
  • C. It challenges the prevailing model of star formation.
  • D. It contradicts theories about the beginning of the universe.

 

  1. Why did the greenhouse-gas solution fail to explain the early presence of liquid water on Earth and Mars?
    [CHOOSE 2 ANSWERS]
  • A. The types of gases that were present in their atmospheres could not have caused temperatures to rise.
  • B. There was insufficient carbon dioxide in their atmospheres to produce a greenhouse effect.
  • C. Solar radiation would have destroyed the ammonia in their atmospheres.
  • D. Clouds of ammonia would have lowered temperatures by blocking out sunlight.

 

  1. Why does the professor mention the solar wind?
  • A. To explain a way the Sun is losing mass.
  • B. To point out that it was less intense billions of years ago.
  • C. To suggest a reason for early climate differences between Earth and Mars.
  • D. To explain the importance of solving the faint-young-Sun paradox.

 

  1. What factor did astronomers consider when calculating the required solar mass for liquid water to exist on Earth and Mars?
  • A. The young Sun lost mass at a slower rate than it currently does.
  • B. The young Sun was closer to the planets than it currently is.
  • C. The young Sun had less solar wind activity than it currently does.
  • D. The young Sun comprised greater amounts of helium than it currently does.

 

  1. What is the professor’s attitude about the bright-young-Sun solution?
  • A. He is surprised that it is not more widely accepted.
  • B. He feels that it raises too many unanswerable questions.
  • C. He is confident that future research will determine whether it is true.
  • D. He expects that other possible solutions to the paradox will be proposed.


答案:
D C BC A B C

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