Descriptive Astronomy 101
Earth - Impacts Study Guide


After the "Earth - Impacts" lectures and readings you should be able to answer and discuss the following questions.

Why is the study of impact events important for us here on Earth?

How many impact structures have been identified on Earth?

What is the accretion process for planetary formation?

When did the accretion process end? When did the planets stop forming?

How much material is being added to the Earth every day? (answer in metric tons)

What size material is typically being added to the Earth?

What happens to this material as it is enters the Earth's system?

What is a meteoroid?

What is a meteor?

What is a meteorite?

What is a micrometeorite?

What is the difference between a penetration crater and a hypervelocity impact crater in terms of object size, and formation process?

In the past century, when and where has the Earth had impacts or near misses with large objects?

What are the factors in predicting future large impacts?

How often do large impacts occur on Earth?

What are the typical impact velocities for asteroids? comets?

How is the energy released in an impact calculated?

How much energy is released in a large impact?

What is the relationship between object size, and the occurance of an impact?

What is the damage that could potentially result from a large impact?