L2
讲座
1. What aspect of 55 Cancri e does the professor mainly discuss?
Its surface temperatures
Its distance from the star it orbits
The composition of its interior
The planetary system it is located in
2. What does the professor point out about the length of a year on 55 Cancri e?
It affects the distribution of heat on the exoplanet’s surface.
It makes the exoplanet relatively easy to study
It is the shortest year of any exoplanet studied to date.
It is gradually getting shorter.
3. According to the professor, what factors contribute to the temperature difference
between the two sides of 55 Cancri e?（多选题）
One side of the exoplanet ahvays faces its star.
Only one side of the exoplanet is covered in lava.
The exoplanet has a thin atmosphere.
The gravitational pull of the exoplanet’s star is stronger on one side than on the other.
4. Why does the professor mention tidal dissipation?
To explain the surface features of 55 Cancri e
To suggest that 55 Cancri e might eventually crash into its star
To identify the method scientists used to develop a heat map of 55 Cancri e
To explain how gravitational force might contribute to the high temperature of 55 Cancri e
5. What can be inferred about the professor when he discusses differences between
55 Cancri e and Earth?
The differences enhance his appreciation for the uniqueness of Earth’s climate.
The differences make him pessimistic about finding Earth-like planets.
The differences concern him less than the similarities do.
The differences lead him to question the current theory of planet formation.
6. Why does the professor mention small, cool stars?
To remind students of the different types of stars that exoplanets can orbit
To compare the Sun to the star that 55 Cancri e orbits
To suggest where astronomers should search for rocky exoplanets in the future D.
To describe one of the most common types of star found in the universe
