Asteroid Bennu

Planetary Defense at NASA

In 2016, NASA established the Planetary Defense Coordination Office (PDCO) to manage the agency's ongoing mission of finding, tracking, and better understanding asteroids and comets that could pose an impact hazard to Earth. Here you can stay informed about the PDCO, NASA's Near-Earth Object (NEO)  Observations Program, and upcoming planetary defense flight missions, including NASA'S NEO Surveyor mission.

planetary defense featured content

Near-Earth Asteroids by the numbers

Planetary Defense by the Numbers

Asteroid Didymos and its moonlet, Dimorphos

Relive DART's historic asteroid impact and the science that followed.

NASA Planetary Defense Strategy and Action Plan cover

NASA Releases Agency Strategy for Planetary Defense to Safeguard Earth

NEO Surveyor

Stay updated on NASA's Next-Generation Asteroid Hunter

Asteroid by the Earth Illustration

NASA, FEMA, Other U.S. Partners Simulate Asteroid Impact Response