Dodging Doomsday With a Space Tug

Dodging Doomsday With a Space Tug
  http://sciencenow.sciencemag.org/cgi/content/full/2005/1109/3

  Preventing an asteroid from slamming into Earth may not require
  Hollywood bravado. Two NASA astronauts have hit upon an idea wherein
  a spacecraft uses gravity to literally tow a threatening projectile
  into safer orbit.

See: http://sciencenow.sciencemag.org/cgi/content/full/2005/1109/3
.

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