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  1. Xref: sparky sci.astro:13541 sci.space:18439 sci.physics:21912 sci.environment:14080
  2. Newsgroups: sci.astro,sci.space,sci.physics,sci.environment
  3. Path: sparky!uunet!cs.utexas.edu!torn!utzoo!henry
  4. From: henry@zoo.toronto.edu (Henry Spencer)
  5. Subject: Re: averting doom
  6. Message-ID: <C03BGG.DrD@zoo.toronto.edu>
  7. Date: Wed, 30 Dec 1992 20:55:27 GMT
  8. References: <JMC.92Dec29211051@SAIL.Stanford.EDU> <72616@cup.portal.com>
  9. Organization: U of Toronto Zoology
  10. Lines: 13
  11.  
  12. In article <72616@cup.portal.com> lordSnooty@cup.portal.com (Andrew - Palfreyman) writes:
  13. >I like the simplicity of this idea (moving the Earth instead of
  14. >trying to shield it), but what the heck's all this "elastic
  15. >collisions" stuff? ...
  16. >Instead, I'd use the "tame asteroid" in a resonant slingshot
  17. >configuration between (say) Mars and Earth...
  18.  
  19. That's what he's proposing.  It turns out that gravity-assist maneuvers,
  20. viewed from a distance, have exactly the behavior of elastic collisions
  21. and can be analyzed as such.
  22. -- 
  23. "God willing... we shall return."       | Henry Spencer @ U of Toronto Zoology
  24.        -Gene Cernan, the Moon, Dec 1972 |  henry@zoo.toronto.edu  utzoo!henry
  25.