L1
讲座
1. What is the lecture mainly about?
Attempts to address a problem affecting space missions
A spacecraft that was damaged by space debris
Ways that space exploration has changed since the first space missions
The paths space debris follow as they orbit Earth
2. Why does the professor mention what happened to two satellites in 2009?
To highlight a significant improvement in satellite design
To explain an increase in the number of fragments orbiting Earth
To emphasize the importance of continued funding for space research
To point out how a collision could have been prevented
3. What does the professor say the United States Space Surveillance Network has been monitoring?
The condition of Earth’s atmosphere
The orbit of plants beyond Earth
Satellites located less than a certain distance from one another
Debris larger than a certain size
4. What does the professor point out about particles of space debris than 10 centimeters?
They usually burn up at high speeds.
They can be collected by means of nets and robots.
They can cause damage to spacecraft despite their small size
They are easier to pull into Earth’s atmosphere than larger pieces of debris are.
5. What is the professor’s opinion about the guideline that the international established for equipment in space?
It has not proven to be effective.
It should be modified to include more countries.
It has been misunderstood by regulators.
It is still too soon to make judgment about its outcome.
6. What does the professor imply when he discusses the idea of using harpoons for active removal of debris?
There are other ideas that have greater support.
The harpoons are not yet ready for use.
Using harpoons is more expensive than using nets or robots.
The harpoons may not be able to break through satellites’ protective shields.
