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Article #641Re: Hubble constant?
From: John C. Baez
Date: Tue, 04 Aug 1992 14:02
Date: Tue, 04 Aug 1992 14:02
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In article <Aug.3.15.57.23.1992.22500@ruhets.rutgers.edu> bweiner@ruhets.rutgers.edu (Benjamin Weiner) writes: >Now for the astronomy viewpoint: >The Hubble constant (H_0) has dimensions velocity/distance (so is an inverse >time, really) and is currently thought to be somewhere in the range >50-100 km/s/Mpc. The amusing part is that there is one camp of people who are SURE it's close to 50, while the other camp is SURE it's close to 100, and they argue and argue about it, so everyone else opts for about 75 as a round figure. I can imagine learned expert X saying "the world is round" and learned expert Y saying "the world is flat" and the nonexperts splitting the difference and saying "it's round on one side and flat on the other." >Additionally there is the deceleration parameter q_0 (no fair calling >it a fudge John. The cosmological constant ... now there's a fudge) I'm sorry, I agree that in GR it's to be expected; I just like teasing cosmologists (see above).
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Newsgroups: sci.physics Path: arc1-ca.pugleaf.net!sparky!uunet!usc!sdd.hp.com!think.com!snorkelwacker.mit.edu!galois!riesz!jbaez From: jbaez@riesz.mit.edu (John C. Baez) Subject: Re: Hubble constant? Message-ID: <1992Aug4.140237.18651@galois.mit.edu> Sender: news@galois.mit.edu Nntp-Posting-Host: riesz Organization: MIT Department of Mathematics, Cambridge, MA References: <1468500004@igc.org> <1992Aug3.155549.9874@galois.mit.edu> <Aug.3.15.57.23.1992.22500@ruhets.rutgers.edu> Date: Tue, 4 Aug 92 14:02:37 GMT Lines: 20