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When it comes to dangerous asteroids striking Earth, it's not a matter of if, it's a matter of when. We have begun to track projectiles large enough to destroy our planet, and we are in the clear for the foreseeable future. However, there are countless asteroids large enough to take out an entire city that we cannot see. Matthew O'Dowd goes over our defensive options in this week's episode of Space Time!
B612 and the Sentinel mission:
NASA's Near Earth Object program, with links to contributing international search programs:
The Hypervelocity Asteroid Impact Vehicle: