Day of Action Deep Prep: Planetary Defense

The protection of Earth from hazardous asteroids and comets—planetary defense—is one of the three core enterprises of The Planetary Society. Working through this deep prep session will increase the participant's expertise on the major issues, recent history, and politics driving planetary defense policy in the United States.



  • Be able to clearly explain the concept of planetary defense and NASA's role in it

  • Understand the threat that near-Earth objects pose to Earth, and what can be done to prevent a potential impact in the future

  • To list the current planetary defense missions underway at NASA