NASA scientists were working on a "gravity tractor" to deflect Earth-bound asteroids; rejected methods include nuclear explosions and painting such asteroids white, which would cause them to reflect solar energy and thus change course. | Harper's Magazine

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NASA scientists were working on a “gravity tractor” to deflect Earth-bound asteroids; rejected methods include nuclear explosions and painting such asteroids white, which would cause them to reflect solar energy and thus change course.

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NASA scientists were working on a “gravity tractor” to deflect Earth-bound asteroids; rejected methods include nuclear explosions and painting such asteroids white, which would cause them to reflect solar energy and thus change course.

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