Phil Plait: How to defend Earth from asteroids

The video discusses the catastrophic asteroid impact that led to the extinction of dinosaurs 65 million years ago, highlighting the scale of the event and its global effects. It then explores smaller asteroid impacts, such as the 1992 event and the Tunguska explosion, and their potential to cause significant damage. The video emphasizes the importance of detecting and preventing asteroid threats, mentioning NASA's efforts and the potential threat of the asteroid Apophis. It outlines various asteroid deflection techniques, including the use of space probes and ion drives, and introduces the B612 Foundation's work in asteroid deflection.

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