When asteroids threaten Earth, science races from detection to deflection.

Go beyond movie fiction to see how astronomers track near-Earth objects, measure impact risk, and study past collisions from Tunguska to Chelyabinsk. The series reveals the telescopes, models, and missions built to spot danger early and even change an asteroid's course, making each episode a sharper look at planetary defense worth signing up to explore.

Episode guide

2 episodes

1Planetary Defense

At first glance, it appears unlikely that we are under threat from extraterrestrial objects. Yet, at any moment, the sky could fall on our heads. Our solar system contains millions of objects known as asteroids.

51 min

2Exploration

For more than two hundred years, astronomers have been wondering what asteroids are actually like. They believe that these primitive rocks have been concealing countless secrets for billions of years. From the depths of space to laboratories on Earth, scientists are trying to unlock these secrets.

52 min

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