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Given enough lead time, asteroids on a collision course with Earth can be safely deflected using a handful of methods. One of these is the gravity tractor technique, in which a robotic probe flies alongside a space rock for months or years, gradually nudging it off course via a slight gravitational tug.
The greater the shepherding probe’s mass, the stronger its gravitational pull is. And poaching a boulder off a potentially hazardous asteroid would allow a deflection mission to increase its mass significantly without having to pay any additional launch costs.
"We’d go into this enhanced gravity tractor position after we retrieve the boulder and demonstrate that we have even more gravity attraction capability by doing that," Lindley Johnson, program executive for NASA’s Near-Earth Object (NEO) observations program, told reporters in March.
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*A new life awaits you in the off-world colonies, a chance to begin again… inquire now about an exciting role in our Asteroid Traffic Control program, all possible thanks to the early efforts of that philanthropic organization, the B612 Foundation. Mapping the heavens above to keep us safe below.* #sentfrom2018withlove