Return-path: X-Andrew-Authenticated-as: 7997;andrew.cmu.edu;Ted Anderson Received: from beak.andrew.cmu.edu via trymail for +dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl@andrew.cmu.edu (->+dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl) (->ota+space.digests) ID ; Thu, 11 Jan 90 01:42:54 -0500 (EST) Message-ID: Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Thu, 11 Jan 90 01:42:21 -0500 (EST) Subject: SPACE Digest V10 #414 SPACE Digest Volume 10 : Issue 414 Today's Topics: Re: Frequently asked SPACE questions Re: Red Shifts through Random Media test Re: SPACE Digest V10 #370 ---------------------------------------------------------------------- Date: 10 Jan 90 20:57:13 GMT From: crdgw1!crdos1!davidsen@uunet.uu.net (Wm E Davidsen Jr) Subject: Re: Frequently asked SPACE questions In article <9001101200.AA13919@amelia.nas.nasa.gov> eugene@AMELIA.NAS.NASA.GOV (Eugene Miya) writes: | 1) Where do I find some information about space? | Try you local public library first. You do know how to use a library, don't | you? Can't tell these days. The net is not a good place to ask for | general information. Ask individuals if you must. There are other sources, | use them, too. The net is a place for open ended discussion. This answer is really too general to be useful. I would assume that people reading this list know about libraries and bookstores. How about the names of some good overview books, and a few books in each of a few common categories, such as orbital math, rocket engine design principles, etc. The problem with many libraries is that there is no way to tell without reading if an older book is outdated or a great explanation of basic principles which were pretty well known in the 40's. If this list is intended to help people, it should include some older books which might be in a library, and some recent books which might be in a library or might have to be ordered. You can also list some non-obvious sources, like reloading (gun) manuals for the math involved in inertial exterior ballistics in a compressible fluid. It is enough to give a good look at some reentry problems for non-powered objects, and is not one which might come to mind unless you're a gun fancier. If you're willing, how about a set of good questions compiled from the net, preferably with answers from the posters. You be the judge of general interest, etc. I'll contribute a few (but I don't have the answers): What's a good reference on the yield of chemical propellants? nozzle design? simple orbital dynamics (formulas, not theory) This type of thing could really be useful to someone who wants to study one area without having the time or interest to study the entire field of all things space related as some posters have for business or personal reasons. -- bill davidsen (davidsen@crdos1.crd.GE.COM -or- uunet!crdgw1!crdos1!davidsen) "I'm a left-handed vegitarian, and my hobbies are judo and the number three" Babs Wilcox, _Don't Get Even, Get Odd_ ------------------------------ Date: 10 Jan 90 23:14:21 GMT From: zaphod.mps.ohio-state.edu!samsung!cs.utexas.edu!jarvis.csri.toronto.edu!csri.toronto.edu!wayne@tut.cis.ohio-state.edu (Wayne Hayes) Subject: Re: Red Shifts through Random Media In article <7628@hubcap.clemson.edu> panoff@hubcap.clemson.edu (Robert M. Panoff) writes: > apparently if light is passed through a random medium, >and this experiment has been done in some labs already, the light is red >shifted. Naturally, this has consequences for interpreting red shifts >from "distant, fast moving" galaxies as possibly being closer, but the (I guess we should have followups directed to sci.astro only) This isn't the only message that has prompted this response... I think some clarification is in order. Red shifting is by no means the only evidence we have, assuming the expansion of the universe, that these objetcs are "far away". For one, the objects in question generally get smaller and dimmer the higher the red shift, one sure sign that they are far away. (Assuming we aren't at the "centre" of a universe that has smaller galaxies "further out", an assumption most astronomers, and I suspect most scientists in general, are happy with.) And the ratios of the distances calculated by these three methods jibe quite well. This does not eliminate some "steady-state" models in which the universe is continually expanding but had no beginning, but it still supports a "large" universe. Yes, we may discover some time in the future that red shifting is caused by something other than the expansion of the universe, but it's size, as far as I can see, will still be within the error bounds currently used. -- The 'C' programming language is, at worst, the second best language for any given application. Usually, however, it is the best. -- anon Wayne Hayes INTERNET: wayne@csri.toronto.edu CompuServe: 72401,3525 ------------------------------ Date: 11 Jan 90 00:30:38 GMT From: elroy.jpl.nasa.gov!jato!mars.jpl.nasa.gov!baalke@cs.ucla.edu (Ron Baalke) Subject: test Test message. Ron Baalke | baalke@mars.jpl.nasa.gov Jet Propulsion Lab M/S 301-355 | baalke@jems.jpl.nasa.gov 4800 Oak Grove Dr. | Pasadena, CA 91109 | ------------------------------ ReSent-Message-ID: ReSent-Date: Wed, 10 Jan 90 19:48:44 -0500 (EST) ReSent-From: "Todd L. Masco" ReSent-To: Space Date: Wed, 10 Jan 1990 08:35-EST From: Ingemar.Hulthage@ISL1.RI.CMU.EDU Reply-To: iaeh@cs.cmu.edu Subject: Re: SPACE Digest V10 #370 I would appreciate pointers to up-to-date information on Neptune, especially information relating to the fly-by in August. Ingemar ------------------------------ End of SPACE Digest V10 #414 *******************