天文学
Moon Formation
1.What is the main purpose of the lecture
- A. To compare the composition of the Moon with the composition of Earth
- B. To explain the significance of moon samples obtained by Apollo astronauts
- C. To discuss theories about the early development of the solar system
- D. To discuss problems with explanations for the origin of the Moon
- 2.What is one point the professor makes about the capture theory?
- A. It accounts for the difference in composition between Earth and the Moon.
- B. It lost popularity when the fission theory was proposed.
- C. It is based on the assumption that Earth’s gravitational field has remained constant.
- D. It was challenged by the Apollo findings.
3.What assumption do the giant impact theory and the fission theory have in common?
- A. The Moon increased in size after its formation.
- B. The Moon was formed from part of Earth.
- C. The young Earth rotated very slowly.
- D. The young Earth collided with another planetary object.
4.According to the professor, how do astronomers who support the giant impact theory explain the Moon’s lack of iron?
- A. Excess iron was ejected into space during the impact.
- B. Earth’s outer layer never contained iron.
- C. The impact happened after Earth’s iron moved to its core.
- D. The Moon lost its iron when it was struck by meteorites.
5.According to the professor, what does a computer model of the giant impact suggest? Click on 2 answers
- A. The object that hit Earth had a mass similar to that of Mars.
- B. The Moon was formed during the late stages of Earth’s formation.
- C. A single impact could not have produced a Moon lacking in iron.
- D. Earth’s rotation rate changed after the impact.
6.What is the professor’s attitude about the giant impact theory?
- A. He is confident that the questions it raises will soon be answered.
- B. He hopes it will be replaced by a new theory in the near future.
- C. He favors it for its consistency with a concept of planet formation.
- D. He thinks it was accepted too quickly by the scientific community
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