真题Set1L2

1. What is the lecture mainly about?

A. Reasons why exoplanets tend to have retrograde orbits

B. Different methods used to discover giant gas exoplanets

C. A new discovery about the formation of distant stars and planets

D. The detection of an exoplanet and its unusual characteristics

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2. Why does the professor point out that stars and planets form from swirling gas clouds?

A. To help explain how planetary orbits are initially established

B. To help students remember a theory about gas giant planets

C. To emphasize the indirect nature of astronomical research

D. To suggest an explanation for the thick clouds on WASP-17b

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3. According to the professor, what are two weaknesses of the method of using a star’s wobble to detect exoplanets? 

Click on 2 answers.

A. Equipment used to observe stars is more sensitive to blue shifts than to red shifts.

B. It is impossible to detect a wobble created by low-mass objects in orbit

C. The method is useful only when the star’s distance from Earth is affected

D. Some stars wobble without the influence of an orbiting object.

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4. What does the professor suggest about the analogy of the spinning top?

A. It helps explain an important aspect of the red-blue starlight shift.

B. It provides only a basic illustration of the process that could change a planet’s orbit

C. It overstates the impact that gravity has on the motion of distant stars

D. It demonstrates why retrograde orbits tend to be less stable than regular orbits.

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5. What does the professor say contributes to WASP-17b’s large diameter?

A. WASP-17b’s gas composition allows it to expand easily when heated.

B. WASP-17b’s retrograde orbit causes it to expand

C. WASP-17b’s strong gravitational force continually pulls in new material.

D. WASP-17b collided with many other planets early in its formation

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6. What is the professor’s opinion regarding WASP-17b’s internal heat?

A. It will probably destroy the planet’s atmosphere eventually. 

B. It indicates that WASP-17b is closer to its star than originally thought.

C. It is likely to decrease as WASP-17b continues to expand in size.

D. It is probably the result of two independent processes.

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