Date: Tue, 30 Mar 93 05:56:43 From: Space Digest maintainer Reply-To: Space-request@isu.isunet.edu Subject: Space Digest V16 #390 To: Space Digest Readers Precedence: bulk Space Digest Tue, 30 Mar 93 Volume 16 : Issue 390 Today's Topics: Why is Venus so bad? Why is Venus so hot? Welcome to the Space Digest!! Please send your messages to "space@isu.isunet.edu", and (un)subscription requests of the form "Subscribe Space " to one of these addresses: listserv@uga (BITNET), rice::boyle (SPAN/NSInet), utadnx::utspan::rice::boyle (THENET), or space-REQUEST@isu.isunet.edu (Internet). ---------------------------------------------------------------------- Date: Tue, 30 Mar 1993 05:54:03 GMT From: Frank Crary Subject: Why is Venus so bad? Newsgroups: sci.space,rec.scuba In article <1993Mar30.013850.19207@herboid.uucp> adb@herboid.uucp (Anthony DeBoer) writes: >>Nowhere near. Canadian scuba divers use Molson's law to predict >>nitrogen narcosis: each 33 feet of water (1 atm) is the equivalent of >>ingesting one Molson (a brand of beer)... >>And it _may_ be possible to live at 100 atms ambient, provided the >>atmosphere is very, very inert and contains only very small partial >>pressures of anything reactive, like O2, N2 or CO2. ... >Divers have been down to the vicinity of 2000' (approx. 60 atms, although >my copy of Guiness with the exact number as of a few years ago is in a >box packed away somewhere; I do remember that it was French >commercial/military divers who set the record), though, which isn't quite >100 atms, but is within an order of magnitude, so eventually I'm sure >we'll see it done. The extremely deep dives don't use anything close to a "normal" air mixture: Instead of 20% oxygen/80% nitrogen, they use something like 1% oxygen/99% helium. An inert gas like helium avoids alot of the problems of very high pressures (if you don't mind working with Mickey Mouse and Donald Duck...) Frank Crary CU Boulder ------------------------------ Date: Tue, 30 Mar 1993 05:59:11 GMT From: Frank Crary Subject: Why is Venus so hot? Newsgroups: sci.space In article henry@zoo.toronto.edu (Henry Spencer) writes: >To make Venus habitable, we really have to get *rid* of most of the >atmosphere somehow. It's a hard problem; the old ideas about just >seeding the atmosphere with algae or bacteria were hopelessly naive. I assume someone earlier in the discussion showed that 100 atm. pressurized domes/structures weren't feasable. But what about a combination? If you raise the internal pressure to 50 atm, the structural requirements become reasonable, and 50 atm is breathable with a helium/oxygen mix. Frank Crary CU Boulder ------------------------------ id ac01701; 30 Mar 93 1:45:04 EST To: bb-sci-space@CRABAPPLE.SRV.CS.CMU.EDU Xref: crabapple.srv.cs.cmu.edu sci.astro:33779 sci.space:59742 Newsgroups: sci.astro,sci.space Path: crabapple.srv.cs.cmu.edu!fs7.ece.cmu.edu!europa.eng.gtefsd.com!emory!darwin.sura.net!bogus.sura.net!udel!wupost!uunet!pipex!marble.uknet.ac.uk!mcsun!news.funet.fi!hydra!klaava!mvarila From: Mikael J Varila Subject: Re: Omnimax Message-Id: <1993Mar29.092431.1425@klaava.Helsinki.FI> Organization: University of Helsinki X-Newsreader: TIN [version 1.1 PL6] References: <1993Mar29.075837.21156@sics.se> Date: Mon, 29 Mar 1993 09:24:31 GMT Lines: 7 Sender: news@CRABAPPLE.SRV.CS.CMU.EDU Source-Info: Sender is really isu@VACATION.VENARI.CS.CMU.EDU We've got two Omnimax theaters here in finland : one in helsinki (in the science center Heureka) and one in oulu (I think this one is also in a science center). The one in Heureka has shown some local films - nothing spectacular. ------------------------------ End of Space Digest Volume 16 : Issue 390 ------------------------------