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- From: pg@sanitas.stortek.com (Paul Gilmartin)
- Newsgroups: sci.astro
- Subject: Re: Averting doom
- Message-ID: <1992Dec27.153900.15963@stortek.com>
- Date: 27 Dec 92 15:39:00 GMT
- References: <1992Dec27.070033.18932@hpcvaac.cv.hp.com>
- Sender: usenet@stortek.com
- Organization: Storage Technology Corp.
- Lines: 18
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-
- bill nelson (billn@hpcvaac.cv.hp.com) wrote:
- : :
- : : Larry Niven, in "A World out of Time", suggested moving a gas giant
- : : planet into Earth's orbit a few degrees ahead of the Earth. The
- : : resulting gravitational perturbation would gently accelerate the
- :
- : I suspect that the tidal forces would destroy the Earth.
-
- The arithmetic favors the engineer: the tidal strain varies as the
- inverse cube of the distance; with a big enough mass far enough
- away, you can move the Earth without crushing it. The Moon moves
- the Earth measurably.
-
- : Also, to move the Earth into a higher orbit, you would not speed the
- : Earth up - you would slow it down. The Earth orbits the sun about
- : 3 miles/second faster than Mars does.
-
- Jmc has correctly refuted this in his followup.
-