Our space experts discuss why tracking and diverting killer asteroids is finally being taken seriously.

Our space experts discuss why tracking and diverting killer asteroids is finally being taken seriously.

Our space experts discuss why tracking and diverting killer asteroids is finally being taken seriously.&nbsp;
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Defending Planet Earth

Aviation Week & Space Technology editors take a look at some of the bigger-picture issues in the world of aerospace and defense

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Aviation Week &amp; Space Technology editors take a look at some of the bigger-picture issues in the world of aerospace and defense