The Null Device

Alexander Abian would be proud; astronomers in the U.S. are proposing to alter Earth's orbit (and presumably its tilt as well), by using the gravity of a large asteroid (how large? sufficiently large that they would have to aim it very carefully, as not to wipe out all life on the planet). Mind you, their intent is not so much to do away with natural disasters and diseases as to keep the Earth habitable in a billion or so years' time, when the Sun increases in brightness.

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