Should the radio telescopes that are (or are not, as the case may be) patrolling the skies, detect an asteroid that potentially poses a threat to Earth, a space probe which acts as a “gravity tractor” may be our first, and possibly only, line of defence against disaster.
A “gravity tractor” could deflect an Earth-threatening asteroid [...]
Gravity tractors could farm the fields of itinerant asteroids
Posted by John Lampard on Monday, 4 August, 2008 to the comment subset
