HDTenEightyP/NetNews huggingface dataset:
From: Bruce_Dunn@mindlink.bc.ca (Bruce Dunn)
Subject: DC Engines (was Re: Shuttle replacement)
Organization: MIND LINK! - British Columbia, Canada
Date: Mon, 23 Nov 1992 06:23:33 GMT

> Allen W. Sherzer writes:
>
> DC-Y will use larger engines (about 200K pounds of thrust each). There
> are two options available:
>
> 1. A new engine called the RL-200 which initially is composed of some
>    off the shelf components and some new components.
>
> 2. Using Apollo J2 engines. This will significantly cut into payload
>    but will support continuous imporvement of the overall system.


        Any possibility of using the HM-60 engine being developed for the
Ariane V?  A 5 year old book (Advanced Chemical Rocket Propulsion by Y.M.
Timnat) gives the following:

                          RL-10 A3-3  J2       HM-60      SSME

Vacuum thrust, kN          67         1044     1025       2130
Vacuum Isp                 444        425      430        455
Mixture ratio              5          5.5      5.1        6
Combusion Pressure, MPa    3.2        5.36     10         20.7
Expansion Ratio            40         27.5     106.2      77.5
Length, m                  1.91       3.38     2.9        4.24
Mass                       132        1542     1100       3065

        If these projected number have been realized, the HM-60 looks like a
slightly lighter substitute for the J2.  Buying them might be easier than
reactivating J2 production.  I am somewhat surprised that the HM-60 Isp is
only 430, considering the low mixture ratio, the high expansion ratio, and
the higher chamber pressure.

--
Bruce Dunn    Vancouver, Canada   Bruce_Dunn@mindlink.bc.ca
From: roberts@cmr.ncsl.nist.gov (John Roberts)
Newsgroups: sci.space
Subject: Re: Space suit research?
Date: 15 Nov 92 23:31:13 GMT
Article-I.D.: cs.Bxs6ou.2F4.1
Distribution: sci
Organization: National Institute of Standards and Technology formerly National Bureau of Standards
X-Added: Forwarded by Space Digest
Original-Sender: isu@VACATION.VENARI.CS.CMU.EDU


-From: prb@access.digex.com (Pat)
-Subject: Re: Space suit research?
-Date: 15 Nov 92 05:31:27 GMT
-Organization: UDSI

-In article <BxMxsF.GA0.1@cs.cmu.edu> roberts@cmr.ncsl.nist.gov (John Roberts) writes:
->Thanks for the confirmation. 8.4 psi sounds plausible - 10.2 seemed a little
->high, since they always depressurize somewhat in preparation for an EVA.

-What's the big push for a earth normal type atmosphere?
-apollo, etc, ran fine on low pressure pure O2,  does better pressure 
-greatly improve cooling.  

(1) Henry says it does.
(2) It "stands to reason" - five times as many molecules to conduct the
heat.

-or are there long term bio effects????

There *may* be. For example, one of the Apollo astronauts, after a busy day
on the moon, had bleeding under his fingernails - thought to be mainly a
result of the low pressure. Little indications like that made NASA uneasy. :-)

John Roberts
roberts@cmr.ncsl.nist.gov
Newsgroups: sci.space
From: amon@elegabalus.cs.qub.ac.uk
Subject: Re: Shuttle computers
X-Added: Forwarded by Space Digest
Organization: [via International Space University]
Original-Sender: isu@VACATION.VENARI.CS.CMU.EDU
Distribution: sci
Date: Fri, 20 Nov 1992 20:39:06 GMT

Rob Andrews said he was looking for this reference:

Gene D. Carlow, 'Architecture of the Space Shuttle Primary Avionics  
Software System', CACM 27, 926-936, (1984).
From: daver@sunspot.ssl.berkeley.edu (David Ray)
Newsgroups: sci.space
Subject: Re: SATELLITE PHOTO
Date: 23 Nov 1992 18:29:07 GMT
Organization: /etc/organization
NNTP-Posting-Host: sunspot.ssl.berkeley.edu

>In article <16NOV92.12028663.0072@VM1.MCGILL.CA> IEGS@MUSICB.MCGILL.CA (IEGS000) writes:
>>COULD SOMEONE HELP ME: SUPPOSE A HURRICANE JUST BLEW IN! WHERE CAN I
>>FIND A SATELLITE PHOTOS OF IT'S PROGRESS?

If you have internet access during the storm, you can FTP weather satellite
photos of N. America which are updated every hour. The images are in GIF
format so you need appropriate viewing software (shareware GIF viewers
are available for PC's and Macs.) 

Do this:                    by typing this:

FTP to the site:            ftp 128.174.5.98
login as:                   anonymous
change directories:         cd WX
set binary transfer mode:   binary
list available GOES images: ls CV*
get the desired file:       get CVmmddhh.GIF
end ftp session:            bye

The image files are in the form CVmmddhh.GIF where mmddhh is the month, day
of month, andhour in Greenwich standard time. (For example, CV112316.GIF)
These files are about 90k and are kept for a day or two. There are also
higher-resolution versions of the same files, about 350k, which they only
keep the latest version of due to hard disk limitations -- this file is 
named CVIS.GIF.

Finally, a non-smart-ass answer.

Dave

Newsgroups: sci.space
From: sysmgr@king.eng.umd.edu (Doug Mohney)
Subject: Re: Space suit research?
Date: Tue, 17 Nov 92 18:07:45 GMT
Organization: Computer Aided Design Lab, U. of Maryland College Park
Distribution: sci
Reply-To: sysmgr@king.eng.umd.edu

In article <1992Nov17.104219.1@vf.jsc.nasa.gov>, oliver@vf.jsc.nasa.gov writes:

>For normal mission operations, only the 14.7 and 10.2 psi regulators are used.
>For emergency operations, the orbiter has an 8 psi regulator that is capable
>of maintaining a cabin pressure of 8 psi with a two inch hole in the cabin.
>Enough nitrogen and oxygen are kept in reserve to allow for an emergency
>deorbit and entry with the cabin at the reduced pressure.

That's a pretty big hole, once you go through the shuttle tiles and/or glass.
How long would it take for emergency deorbit, assuming *sigh* you still have
all the other systems intact to make it down?


                 Play in the intelluctual sandbox of Usenet 

  -- >                  SYSMGR@CADLAB.ENG.UMD.EDU                        < --
Newsgroups: sci.space
From: gary@ke4zv.uucp (Gary Coffman)
Subject: Re: Automated space station construction
Reply-To: gary@ke4zv.UUCP (Gary Coffman)
Organization: Gannett Technologies Group
Date: Sat, 14 Nov 1992 14:34:54 GMT

In article <1992Nov12.152633.13688@hal.com> bobp@hal.com (Bob Pendleton) writes:
>From article <1992Nov12.044348.827@ke4zv.uucp>, by gary@ke4zv.uucp (Gary Coffman):
>> Military COBOL and Intel processors, FRED IS DOOMED. :-) :-)
>
>Get your history straight. COBOL was a US Navy project. The Air Force
>also had it's own programming language. ADA is the result of
>inter-service rivalry :-)

I called Ada military COBOL because it's almost as wordy. Actually I
like Ada and have coded some serious applications in it. It's C++ with
an attitude. :-)

Gary

Newsgroups: sci.space
From: mccall@mksol.dseg.ti.com (fred j mccall 575-3539)
Subject: Re: NASA Coverup
Keywords: snarfy concedes
Organization: Texas Instruments Inc
Date: Wed, 18 Nov 1992 21:38:47 GMT

In <83633@ut-emx.uucp> wolfone@ccwf.cc.utexas.edu (Patrick Chester) writes:

>In article <1992Nov11.001713.12288@aio.jsc.nasa.gov> hack@arabia.uucp (Edmund Hack) writes:
>]In article <4608@cruzio.santa-cruz.ca.us> snarfy@cruzio.santa-cruz.ca.us writes:
>]>    I  will  continue , however to point out alternative theories to account
>]>   for various facts  of  nature.  Theories  are  not  science,  but  merely
>]>   suggestions  of  possible  explanations  for  observed  phenomena  .   An
>]>   alternate theory need only be logically and mathematically consistent  to
>]>   be as viable as relativity , or any other theory.

At least learn what 'theory' means when used in the context of
science.  First, what you apparently think of as a 'theory' is
actually generally referred to as a 'hypothesis'.  It doesn't become a
'theory' until it is somewhat more solidly based and compared to
observed phenomenon than mere mathematical speculation.  

>]
>]No, what you have is necessary, but not sufficient.  It must also be
>]testable and make some predictions about the universe to be as viable as
>]relativity (General or Special). (This is true to first order.  I am
>]aware that there is some discussion in philosophy of science about
>]falsifiability, as well as other nits.)

This is pretty much REQUIRED for a scientific 'theory' -- it must
exhibit sufficient predictive power to be falsifiable.  In other
words, it must predict things that we can go look at that we don't
know the answers to yet, so that we can then go and see if the things
that it predicts are true.

>It also helps to be a bit diplomatic snarfy. Saying NASA, you are BUSTED is
>not the way to get anybody to listen to you. Indeed, you appear to be both
>an arrogant ass and a raving loon when you use such phrases. It's not kissing
>up to NASA when you avoid what you originally posted, snarfy; it's called 
>being polite. Now, if McElwaine would only follow that advice.

I didn't see the original post (I unfortunately don't read this
newsgroup as often as I used to), but from this I would say that what
was proposed was the standard 'conspiracy theory' sort of thing,
coupled with the usual misunderstanding of just how rigorous the proof
of something must be before it even qualifies as a 'theory'.

See what happens when you don't keep up?  You miss things like this
one.  (another Velikovsky fan?)

-- 
"Insisting on perfect safety is for people who don't have the balls to live
 in the real world."   -- Mary Shafer, NASA Ames Dryden
------------------------------------------------------------------------------
Fred.McCall@dseg.ti.com - I don't speak for others and they don't speak for me.
Newsgroups: sci.space
From: roberts@cmr.ncsl.nist.gov (John Roberts)
Subject: Re: COSTAR
X-Added: Forwarded by Space Digest
Organization: National Institute of Standards and Technology formerly National Bureau of Standards
Original-Sender: isu@VACATION.VENARI.CS.CMU.EDU
Distribution: sci
Date: Mon, 16 Nov 1992 05:02:28 GMT


-From: henry@zoo.toronto.edu (Henry Spencer)
-Subject: Re: COSTAR
-Date: 14 Nov 92 23:48:26 GMT

-In article <Bxor9M.Jq6.1@cs.cmu.edu> roberts@cmr.ncsl.nist.gov (John Roberts) writes:
->There was a replica of COSTAR on display at the World Space Congress.
->I couldn't make head or tail of it...

[Detailed description of COSTAR]

Thanks for the reply. It appears that my interpretation of the NASA Select
video (followup post, that hasn't percolated through yet) was reasonably
close.

-It looks like a weird plant, with
-arms sprouting out in semi-random directions, because the instrument
-viewing apertures are in different places on each instrument.  (Luckily,
-none of the apertures is very large, so small mirrors will suffice.)
-All of this, of course, has to be very rigid and capable of very precise
-adjustment by remote control.

Anything on what degrees of motion can be adjusted? (i.e. swing angle,
arm length, tilt, spacing.)

John Roberts
roberts@cmr.ncsl.nist.gov

Newsgroups: sci.space
From: roberts@cmr.ncsl.nist.gov (John Roberts)
Subject: Re: world in danger
X-Added: Forwarded by Space Digest
Organization: National Institute of Standards and Technology formerly National Bureau of Standards
Original-Sender: isu@VACATION.VENARI.CS.CMU.EDU
Distribution: sci
Date: Fri, 20 Nov 1992 00:24:16 GMT


-From: rjp1@cbnewsc.cb.att.com (be here now)
-Subject: world in danger
-Date: 19 Nov 92 18:51:33 GMT

-Yesterday evening (11/17) on Headline News a short (~1 minute) news
-item was read about a group of scientists who had published a document
-warning us of the danger we're all in becuase of the rapid depletion
-of the ozone and the also rapid extinction of many species of animals.
-The news item was very brief and did not mention any names nor even
-the title of the paper that was published.

-It seems to me that if something as (seemingly) important as this
-ought to have had more attention paid to it than a one-minute news
-blurb without references.  

-Bob Pietkivitch     | "Moon, my long lost friend, is smiling from above."
-rjp1@ihspa.att.com  |  -- Genesis, Stagnation 1970

That's what CNN Headline News is *for*. You're supposed to watch it for
a 30-minute cycle to pick up that item, then turn to the regular CNN
channel and wait for 17 hours until they get around to mentioning it.
(If it's a science item, you might have to wait until the weekend -
they have a very good science show on Saturday mornings, I believe.)

You can record Headline News on a VCR, and capture plenty of 10-15 second
video clips of events such as launches, that dramatic engine explosion
some months back, video from Shuttle or Mir, etc.

John Roberts
roberts@cmr.ncsl.nist.gov
From: 3001crad@ucsbuxa.ucsb.edu (Charles Frank Radley)
Newsgroups: sci.space
Subject: Re: UN Space/Moon Treaty
Date: 18 Nov 92 15:20:37 GMT

In article <711.2B04E3FC@mechanic.Fidonet.org> Lauren.Podolak@mechanic.Fidonet.org (Lauren Podolak) writes:


>Pretty close and it was never signed by the US......

>James
>___
The USA DID sign the UN Moon Treaty.
However, the Senate never ratified the treaty, so it does not
have the force oif law in the USA

Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Magellan Update - 11/23/92
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4   
Keywords:  Magellan, JPL
Reply-To: baalke@kelvin.jpl.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Tue, 24 Nov 1992 11:40:31 GMT

Forwarded from the Magellan Project

                   MAGELLAN STATUS REPORT
                     November 23, 1992

1.  Magellan continues to operate normally, transmitting a
    carrier plus 40 bps X-band signal which is precisely
    tracked by the DSN (Deep Space Network) stations to
    provide gravity data.

2.  The G2325 command sequence was successfully uplinked and
    began execution Friday morning.  Later this morning,
    commands will be sent to change the star pair used for
    starcals.

3.  Early this morning, there was a triple TWTA SSO (spurious
    shutoff of the traveling wave tube amplifier).  The
    spacecraft recovers automatically from these events.

4.  The spacecraft has completed 6160 orbits of Venus; 524 so
    far in Cycle 4, which will end on May 25, 1993.

5.  At 10 am this morning, Dr. David Senske, Magellan Research
    Associate, will speak on Magellan's Gravity Mission and
    Venus' Geophysical Patterns.

6.  A Magellan award ceremony to issue NASA Group Award
    certificates will be held Tuesday, Nov. 24, 1992 at 3:00
    pm in Von Karman Auditorium.
     ___    _____     ___
    /_ /|  /____/ \  /_ /|     Ron Baalke         | baalke@kelvin.jpl.nasa.gov
    | | | |  __ \ /| | | |     Jet Propulsion Lab |
 ___| | | | |__) |/  | | |__   M/S 525-3684 Telos | Learn to recognize the
/___| | | |  ___/    | |/__ /| Pasadena, CA 91109 | inconsequential, then 
|_____|/  |_|/       |_____|/                     | ignore it.

Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 11/23/92
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4   
Keywords:  Mars Observer, JPL
Reply-To: baalke@kelvin.jpl.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Tue, 24 Nov 1992 02:46:37 GMT

Forwarded from the Mars Observer Project

                   MARS OBSERVER STATUS REPORT
                       November 23, 1992
                         11:00 AM PST
                       Launch +59 Days

Sequence C4 remains active and without anomaly.  The static phase
error test was completed last week which verified the DSN (Deep
Space Network) uplink frequency margins with the spacecraft.  The
MAG (Magnetometer) and the GRS (Gamma Ray Spectrometer) remain
powered ON during the sequence, but are quiescent.  The MOC (Mars
Observer Camera) bakeout continues to perform nominally.  A delta
DOR (Differenced One-way Ranging) was performed over the weekend,
as a planned weekly event.

A Command Detector Test is planned to be uplinked Tuesday to
verify the capability to command the spacecraft at a 500 bps uplink
rate.

The spacecraft is now in engineering mode at 2000 bps downlink
with 1 tracking pass per day.  The Spacecraft and science teams
report that all subsystems and payload instruments are performing
very well.
     ___    _____     ___
    /_ /|  /____/ \  /_ /|     Ron Baalke         | baalke@kelvin.jpl.nasa.gov
    | | | |  __ \ /| | | |     Jet Propulsion Lab |
 ___| | | | |__) |/  | | |__   M/S 525-3684 Telos | Learn to recognize the
/___| | | |  ___/    | |/__ /| Pasadena, CA 91109 | inconsequential, then 
|_____|/  |_|/       |_____|/                     | ignore it.

Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 11/16/92
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4   
Keywords:  Mars Observer, JPL
Reply-To: baalke@kelvin.jpl.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Tue, 17 Nov 1992 05:10:56 GMT

Forwarded from the Mars Observer Project

                     MARS OBSERVER STATUS REPORT
                         November 16, 1992
                           11:00 AM PST
                         Launch +52 Days

Flight sequence C3 C completes tomorrow morning just prior to 8:00 A.M.
PST.  Magnetometer and Gamma Ray Spectrometer instrument teams have
been receiving early cruise calibration data.  The Mars Observer Camera
"bakeout" which was initiated in C3 C will continue through December 28.

The C4 sequence uplink took place this morning. C4 will begin execution at
8:00 AM tomorrow upon completion of C3 C.  C4 is 28 days in duration and
continues the MOC bakeout, performs Radio Science Ultra Stable Oscillator
tests, Modulation Index Test, Radio Frequency Subsystem Automatic Gain
Control and Command Data Unit Signal to Noise Ratio tests, and a Static
Phase Error test.

Since launch, the spacecraft has experienced 18 Single Event Upsets
causing memory bit errors.  Fifteen errors occurred in the Standard
Controls Processor (SCP) and 3 in the Engineering Data Formatter (EDF).  On
Saturday, November 14, a one-word Flight Software patch was uplinked to
the spacecraft to correct an error in the algorithm which identifies and
corrects memory bit errors.  Indications are that the problem has been
resolved.

The Spacecraft Team reports that all Mars Observer subsystems continue
to perform well.

Today the spacecraft is 15,072,451 km (9,365,587 miles) from earth,
traveling at a velocity of 3.8144 kilometers per second (8,106 miles per
hour).  One way light time is approximately 50 seconds.
     ___    _____     ___
    /_ /|  /____/ \  /_ /|     Ron Baalke         | baalke@kelvin.jpl.nasa.gov
    | | | |  __ \ /| | | |     Jet Propulsion Lab |
 ___| | | | |__) |/  | | |__   M/S 525-3684 Telos | Learn to recognize the
/___| | | |  ___/    | |/__ /| Pasadena, CA 91109 | inconsequential, then 
|_____|/  |_|/       |_____|/                     | ignore it.

Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Galileo Update - 11/23/92
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4   
Keywords:  Galileo, Gaspra, JPL
Reply-To: baalke@kelvin.jpl.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Tue, 24 Nov 1992 05:22:31 GMT

Forwarded from Bill O'Neil, Galileo Project Manager

                            GALILEO STATUS REPORT
                              November 23, 1992

     The Galileo Spacecraft is operating normally in the dual-spin mode and
is transmitting coded telemetry at 28.8 Kbps (28,800 bits/second).

     Over the weekend, the EE-9 (Earth-Earth 9) sequence memory load was
uplinked to the spacecraft on Saturday, along with performing delta DOR
(Differential One-way Ranging) passes over DSS-14/43 (Goldstone/Canberra)
and DSS-14/63 (Goldstone/Madrid). DACs (Delayed Action Commands) were also
sent on Saturday to perform wobble compensation on Monday in preparation
for the Earth 2 encounter.  Continuous tracking was scheduled over DSS-14,
DSS-43 and DSS-63.

     Today, November 23, 1992, the Gaspra data playbacks are scheduled along
with turning on the SSI (Solid State Imaging Camera) and NIMS (Near Infrared
Mapping Spectrometer) instruments, performing science instrument calibrations,
and updating AACS (Attitude and Articulation Control Subsystem) bright body
avoidance parameters.  Continuous tracking is scheduled over DSS-14, DSS-43
and DSS-63.

     Tomorrow, Gaspra data playbacks are scheduled along with science
instrument calibrations.  Continuous tracking is scheduled over DSS-14,
DSS-43 and DSS-63.
     ___    _____     ___
    /_ /|  /____/ \  /_ /|     Ron Baalke         | baalke@kelvin.jpl.nasa.gov
    | | | |  __ \ /| | | |     Jet Propulsion Lab |
 ___| | | | |__) |/  | | |__   M/S 525-3684 Telos | Learn to recognize the
/___| | | |  ___/    | |/__ /| Pasadena, CA 91109 | inconsequential, then 
|_____|/  |_|/       |_____|/                     | ignore it.

Newsgroups: sci.space.news
From: glennc@cs.sfu.ca (Glenn Chapman)
Subject: Russia's Europe-America 500 sample return mission launched
Apparently-To: uunet!sci-space-news
Followup-To: sci.space
Keywords: Spaceflight, Russian
Organization: CSS, Simon Fraser University, Burnaby, B.C., Canada
Date: Mon, 16 Nov 1992 16:33:16 GMT


     Radio Moscow announced the successful launch of the Europe-American 500 
sample capsule, which will land near the USA. This is a special flight of the 
Photon style sample return type probe, usually devoted to space processing 
flights.  In this case the capsule is filled with items to send "good will 
messages" in celebration the voyage of Columbus.  After 5 days (Nov. 21st) 
the capsule with land about 300 Km (190 mi) off the US's Pacific coast and be 
recovered by a Russian satellite tracking ship.  The Photon capsule will then 
be brought to Seattle, Wash., by about Nov. 26th, where it will be put on 
display.  Note that the Photon usually comes down on land, rather than this 
water type recovery.
     This is apparently a "publicity" type program organize by Photon, the 
Russian company that manufactures the hardware.
     
                                                        Glenn Chapman
                                                        School Eng. Science
                                                        Simon Fraser U.
                                                        Burnaby, B.C., Canada
Newsgroups: sci.space.news
From: yee@atlas.arc.nasa.gov (Peter Yee)
Subject: Shuttle Status for 11/23/92 (Forwarded)
Apparently-To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
Originator: yee@atlas.arc.nasa.gov
Reply-To: yee@atlas.arc.nasa.gov (Peter Yee)
Organization: NASA Ames Research Center, Moffett Field, CA
Date: Mon, 23 Nov 1992 23:35:40 GMT

                                  SPACE SHUTTLE STATUS REPORT
                                  Monday, November 23, 1992
          George H. Diller
          Kennedy Space Center
          407/867-2468

          Vehicle: OV-103/Space Shuttle Discovery
          Current Location: Launch Pad 39-A
          Mission: STS-53/DoD   Inclination: 57 degrees
          Launch:  Dec. 2  6:59 a.m.  Landing: KSC  Dec. 9  12:53 p.m.
          Mission duration: 7 days 5 hours 54 minutes    Crew Size: 5

          IN WORK TODAY:

          - auxiliary power unit tank pressurization and closeouts
          - load mass memory units (MMU)
          - main engine sensor calibrations
          - aft main engine compartment closeouts
          - solid rocket booster closeouts
          - payload closeouts


          WORK SCHEDULED:

          - external tank purges Tuesday
          - close payload bay doors Tuesday night
          - retest Data Display Unit (DDU #1) Tuesday
          - orbiter aft systems confidence test Wednesday
          - pick up countdown 11 a.m. on Sunday for launch on Dec. 2


          WORK COMPLETED:

          - final ordnance operations
          - OMS/RCS tank pressurization
          - change out of DDU #1


          SPECIAL TOPICS: Thursday and Friday are Thanksgiving holidays for
          the launch team and no work is scheduled.  Saturday is a
          contingency day for any catch-up or unscheduled work.
Newsgroups: sci.space.news