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- Newsgroups: sci.space
- Path: sparky!uunet!cs.utexas.edu!usc!wupost!udel!rochester!cantaloupe.srv.cs.cmu.edu!crabapple.srv.cs.cmu.edu!roberts@cmr.ncsl.nist.gov
- From: roberts@cmr.ncsl.nist.gov (John Roberts)
- Subject: Re: Space elevator
- Message-ID: <C0F3uD.16B.1@cs.cmu.edu>
- X-Added: Forwarded by Space Digest
- Sender: news+@cs.cmu.edu
- Organization: National Institute of Standards and Technology formerly National Bureau of Standards
- Original-Sender: isu@VACATION.VENARI.CS.CMU.EDU
- Distribution: sci
- Date: Wed, 6 Jan 1993 05:41:32 GMT
- Approved: bboard-news_gateway
- Lines: 21
-
-
- -From: chris@chrism.demon.co.uk (Chris Marriott)
- -Subject: Re: Question:How Long Until Privately Funded Space Colonizati
- -Date: 5 Jan 93 19:13:12 GMT
-
- -The "space elevator" - basically dropping a cable from a geosynchronous
- -satellite to Earth (and, of course, another one upwards so the centre of
- -mass stays still) is probably the most *lethal* device one might conceive
- -of building! Imagine the cable breaks near the mid-point. You have 38000km
- -of cable falling to earth at *orbital* velocities, enough to wrap itself
- -around the entire equator of the planet! Go figure out the kinetic energy
- -involved. How much ocean would it vaporize? Massive medium-term climatic
- -changes at best - "nuclear winter" scenarios. A new Ice Age a distinct
- -possibility.
-
- Go figure the kinetic energy yourself. I think you'll be pleasantly
- surprised. :-)
-
- John Roberts
- roberts@cmr.ncsl.nist.gov
-
-