Difficulties in Astronomy
Listen to part of a lecture in an astronomy class.
- What is the lecture mainly about?
- A. Recent advances in technology used by astronomers.
- B. How radio astronomy has led to advances in communication technology.
- C. Important discoveries made by radio astronomers.
- D. Difficulties astronomers have in observing the universe.
- What is the professor’s attitude about light pollution in cities?
- A. He feels that it should be carefully regulated.
- B. He believes it is unfortunate.
- C. He thinks astronomers have not done enough to address the issue.
- D. He believes that the severity of the problem is often exaggerated.
- According to the professor, why are radio waves particularly useful for astronomical observations?
[CHOOSE 2 ANSWERS]
- A. Some astronomical bodies emit radio waves but not visible light.
- B. Radio waves provide more information about star composition than visible light waves do.
- C. Radio waves can be detected with simple equipment.
- D. Radio waves can pass through particles in space.
- What does the professor imply is an advantage of optical astronomy over radio astronomy?
- A. It allows for more precise observations.
- B. It is better for making observations within our own galaxy.
- C. It requires less sophisticated equipment.
- D. It is not affected by the weather.
- According to the professor, why do radio astronomers sometimes have difficulty studying very distant objects?
[CHOOSE 2 ANSWERS]
- A. Signals from closer objects interfere with radio waves from space.
- B. Particles in the atmosphere change the direction of radio waves.
- C. Radio waves from space are not very strong.
- D. Light waves from sources on Earth alter radio waves from distant objects.
- What does the professor mean when he says this: 🎧
- A. He wants to emphasize the progress that has been made in radio astronomy.
- B. He thinks radio astronomy and optical astronomy both provide valuable information.
- C. He does not want to spend time discussing the technology of radio telescopes.
- D. He would like the students to give examples of discoveries made with radio telescopes.
D B AD C AC C