天文学 TPO26-L3 Comets

TPO26-L3
Comets

Listen to part of a lecture in an astronomy class. 

1. What is the lecture mainly about?

  • A. The orbits of comets.
  • B. Unique characteristics of a famous comet.
  • C. The structure of comets.
  • D. The origin and life cycle of comets.

2. According to the professor, what happens as a comet approaches the Sun?
[CHOOSE 2 ANSWERS]

  • A. Its nucleus loses some material.
  • B. Its core becomes brighter.
  • C. It moves faster.
  • D. It absorbs gases from the Sun.

3. Why does the professor emphasize the amount of time Hailey’s Comet is beyond the orbit of Jupiter?

  • A. To account for the comet’s composition of ice and dust.
  • B. To show the effect of Jupiter’s gravity on the comet’s orbit.
  • C. To argue that the comet’s orbit should not be considered periodic.
  • D. To explain why the comet is not visible from Earth very often.

4. What is the professor imply about the history of Hailey’s Comet?

  • A. Hailey’s Comet did not always have the same orbit it has now.
  • B. Hailey’s Comet used to be much smaller than it is now.
  • C. Hailey’s Comet has always had the same orbit that it has now.
  • D. Hailey’s Comet is much younger than the rest of the solar system.

5. What is the professor’s opinion about the name “parabolic-orbit comets”?

  • A. It is not widely accepted among astronomers.
  • B. It is probably not strictly accurate.
  • C. It is not a term that the students need to learn.
  • D. It will probably be replaced soon with a new name.

6. According to the professor, what can change a parabolic-orbit into a periodic-orbit comet?

  • A. The loss of some of the comet’s material.
  • B. The force of escaping gases.
  • C. The gravitational influence of a planet.
  • D. Energy from the Sun.

答案:
A AC D A B C

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