ZT-Astronomy: Moon Formation

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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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