home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: sci.astro
- Path: sparky!uunet!haven.umd.edu!darwin.sura.net!wupost!sdd.hp.com!hp-cv!hp-pcd!hpcvaac!billn
- From: billn@hpcvaac.cv.hp.com (bill nelson)
- Subject: Re: Averting doom
- Message-ID: <1992Dec27.070033.18932@hpcvaac.cv.hp.com>
- Organization: Hewlett-Packard Company, Corvallis, Oregon USA
- References: <1992Dec26.153304.8294@stortek.com>
- Date: Sun, 27 Dec 1992 07:00:33 GMT
- Lines: 29
-
- pg@sanitas.stortek.com (Paul Gilmartin) writes:
- : John McCarthy (jmc@SAIL.Stanford.EDU) wrote:
- : : But they say mirrors on Earth or shades in space
- : : potentially could shield our planet from increasing heat
- : : from the sun and delay the catastrophic consequences. Other
- : : possible solutions- building closed environments like the
- : : Biosphere Two project in Arizona... or setting up controlled
- : : Earth-like environments in space.
- : :
- : : A more straightforward solution is to move the earth further from
- : : the sun as the sun warms up. What are the easiest ways of doing
- : : this?
- :
- : 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
- : Earth into a higher orbit. The gas giant is expendable: its
- : substance becomes thermonuclear fuel and reaction mass.
-
- Just like many other things in Niven's writing, his engineering
- knowledge is lacking.
-
- I suspect that the tidal forces would destroy the Earth.
-
- 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.
-
- Bill
-