Listen to part of a lecture in an astronomy class.
- What is the lecture mainly about?
- A. The importance of record keeping in the development of hypotheses.
- B. The relationship between sunspots and Earth’s geomagnetic cycle.
- C. The progression of scientific knowledge about sunspots.
- D. The effect of sunspots on Earth’s climate.
- Why did European astronomers before the time of Galileo not believe sunspots were on the Sun’s surface?
- A. They based their beliefs on earlier observations by Chinese astronomers.
- B. The idea was contrary to their beliefs about objects in space.
- C. The sunspots often changed their shape.
- D. The sunspots were not always visible.
- Which hypothesis regarding sunspots did Galileo challenge?
- A. Sunspots are shadows of planets crossing the Sun.
- B. Sunspots are clouds in the solar atmosphere.
- C. Sunspots are evidence of the Sun’s rotation.
- D. Sunspots are evidence of magnetic fields.
- What was the importance of Schwabe’s observations?
- A. They determined the age of sunspots.
- B. They established that sunspots appear in cycles.
- C. They proved that sunspots were actually on the Sun.
- D. They showed the reason that sunspots change their shape
- What is the professor’s attitude toward Schwabe’s and Wolf’s research?
- A. He is surprised that the research is contradictory.
- B. He is impressed by how many years were spent on the research.
- C. He has difficulty believing that research should take so long.
- D. He doubts that the research is given enough credit by modern astronomers.
- Why does the professor imply about the discovery of a relationship between the sunspot cycle and Earth’s geomagnetic cycle?
- A. It proved that Galileo’s cloud hypothesis was correct.
- B. It showed how conditions on Earth can affect the Sun.
- C. It was the start of modern astronomy.
- D. It led to a period of intense scientific research.
C B A B B D