The Null Device
proud; astronomers in the U.S. are proposing to alter Earth's orbit
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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