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25 new of 323 responses total.
bdh3
response 192 of 323: Mark Unseen   Nov 13 09:00 UTC 2000

Saw _Red Planet_ its opening night on this past Friday.  At a sort of
odd theatre (whole other story that).  Anyway, it still had the
obligatory scene of a spacecraft entering orbit by accelerating. 
Sometimes I figure its just a good shot, other times I figure the
director has such a shot just to piss off folks like russ who demand
realism in a media that by definition is fiction.  Val Kilmer is the odd
hero, despite the fact that in real life he so pissed off his 'co-stars'
by his stunts that one in fact refused to even appear in the same scenes
with him - I will leave it up to the viewer of same to figure out whom.
(He apparently went so far as to snuff cigarettes out on various body
parts of extras and crew to see how far he could go...the brat)

Anyway, this was the counterpart to _Mission to Mars_ and although it
was finished before was held back for some reason.  Its the same fucking
movie, only with all 'ghosts' -caucasians ....sorta, only different, and
a lot, a whole lot more better.  It even has the same scenes, only a lot
better, a sure as shit lot better.  There is one other 'russ' style
quibble, a shot later where the 'lander' is still seen docked with the
'mother ship' but it only is maybe two seconds at best.  And it sure has
a heck of a lot more meta content and is no less a 'cliff hanger' than
its doppleganger.  Its a better do, but I sure wish the 'majors' would
get out of the habit of stealing each others ideas and simply put out
good films.  There is a lot more meaningless 'symbolism' in _Red Planet_
(wasn't that the title of a pulp SF author of some circulation?)  (and
having nothing to do with this plot)  (There is even an odd reference to
Clarke in that one character has the same sirname, and the same
job of one of his novels and flicks of note.) (Stupid clue - 2001)

To make matters worse at one point 'the (a) (one of a few) red shirt(s)'
(none wear, but the trekkies understand the reference) (It is a 'red
planet and thus they all are....only the idiots need this pointed out)
draws a circle in the dirt and drops a stone (the same one!) in the
center in a scene which is echoed back to in the future but with no
particular inclusive significance to tie it together.

In short it is a fine movie, much better crafted than its counterpart
from the opposing team and for some idiotic reason released when it was
for no particuarly good reason.  It could have been tighter with good
editing and had the cast to carry it off to become the SF counterpart to
_The Usual Suspects_ but instead is/was a good do in its opening, but
not successfull and is to be religated to the 7.99 bin at K-mart if it
comes out on video, if it does at all.  Such is the shame and the curse 
of those that hold back and only go for 'half measures'.  (And I only
manages to commit a half spoiler I think in posting this...)
rcurl
response 193 of 323: Mark Unseen   Nov 13 17:34 UTC 2000

How else can an object enter (change) orbit except by accelerating?
Acceleration is a rate of change of velocity and, boy, if you don't
change velocity, you are stardust (or miss). 
tpryan
response 194 of 323: Mark Unseen   Nov 13 17:41 UTC 2000

        To be captured into an orbit, you have to decelerate, that is,
provide thrust against the direction of your travel, otherwise, you 
could continue past the planet.
rcurl
response 195 of 323: Mark Unseen   Nov 13 18:29 UTC 2000

That's an acceleration too. If you are facing backwards, you will
feel it as a subjectively forward acceleration. If you insist on
referencing to the velocity vector, yes, it is a *negative* acceleration. 
(I'm being picky.... 8^P)
gelinas
response 196 of 323: Mark Unseen   Nov 13 21:03 UTC 2000

_Red_Planet_ was one of Heinlein's books.  I remember reading it, but I
*don't* remember the plot.  I should track it down.
mwg
response 197 of 323: Mark Unseen   Nov 13 21:22 UTC 2000

I was at a friends the other night re-watching _Xanadu_ for the zillionth
time, and finally caught a very subtle joke that I had missed for years.
Sonny is confronting the parents of the Muses asking for Terpsichore to be
allowed to return to Earth with him, and the mother is having difficulty
remembering such concepts as earlier/later one-night/forever.

Before I post an answer, does anyone else know why this is funny, and/or
how I worked out the correct name of the Muse in question?
(Obscure mode on.)
aruba
response 198 of 323: Mark Unseen   Nov 13 23:15 UTC 2000

Red Planet is my very favorite Heinlein book of all, and I am disappointed
that someone used the title for a completely unrelated movie.
mcnally
response 199 of 323: Mark Unseen   Nov 14 02:16 UTC 2000

  re #197:  I've never seen the movie, so I'm not sure why Terpsichore
  (although I imagine it has something to do with dance, isn't the movie
  about a roller-disco?)

  Presumably the "joke" with the mother is because the traditional depiction
  of the Muses has them the offspring of Zeus and Mnemosyne (aka "Memory")
mwg
response 200 of 323: Mark Unseen   Nov 14 14:16 UTC 2000

Re: 199 - Exactly.  On previous occasions I had not known the name of the
mother of the Muses, so this time the scene hit me differently.  Olivia
Newton-Johns' character was called Kira (maybe not spelled quite that way)
and at one point she is breaking the news to Sonny and gets out a partial
syllable on her name before Sonny muffles the rest with a kiss.  I looked
up the names of the Muses and found them to be unique in less than a
syllable, so the "te" that got out in the described scene made Terpsichore
the only option.  And yes, it was a roller-disco-dance-musical, so the
Muse of dance fits.  They layered in the jokes heavily, even though most
of the audience would never get them.  They deserve credit for that, at
least.
bdh3
response 201 of 323: Mark Unseen   Nov 15 06:23 UTC 2000

re#192,194,195:  One enters orbit around a planet by attaining orbital
velocity.  I suppose if you were going real slow if you didn't
accelerate you'd simply be captured by the gravitational acceleration of
the object you were near and be accelerated onto the surface of that
object.  But that is usually not the goal of the exercise.  If one is
traveling between two objects, and one wishes to do so in an optimum
time/resources, one accelerates towards the object, turns over and then
'burns' a deceleration such that the 'gravitational acceleration'
captures you into orbit.  Subjectively if one were on the object
decelerating one might feel like one was accelerating in the opposite
direction regardless of the fact that velocity was decreasing.  Perhaps
one could have 'main engines' on both ends of a vehicle, but that would
be rather stupid.  My point remains, I don't think there is a film  -
exception maybe _2001..._ where the craft enters orbit properly ass
backwards (Even in that the jupiter craft was always pointing forward).
(I believe even _Apollo 13_ made this mistake although I am not certian
and that was not an attempt to orbit but to 'slingshot around'.)
senna
response 202 of 323: Mark Unseen   Nov 15 07:30 UTC 2000

Okay, layperson question:  Would it be reasonable to assume that if one were
to somehow accelerate to the velocity of a certain orbit from near the
surface, they would continue away from the planetary body until reaching that
orbit, and then automatically self-correct?
bdh3
response 203 of 323: Mark Unseen   Nov 15 09:46 UTC 2000

No.No. No. No. And yes.  If one were originally doomed to smash into a 
'planetary body' and then accelerate so that one obtained orbit one
would merely orbit said 'body' until such time as the orbit 'decayed'
and one smashed into the surface if one did not burn up if there was
sufficient 'atmosphere'.  There is no 'automatic'.  It is all pure math.
THere are no 'votes', there are no 'opinions', it is all 'fact'.  IT is
all 'math'.  And the fact remains that any idiot that portrays an
accelleration into orbit is an idiot, and probably a fine
'cinematographer'.  Its a good 'shot', has nothing to do with 'real'
science, and  is probably what one should shoot.
senna
response 204 of 323: Mark Unseen   Nov 15 12:22 UTC 2000

Okay, let me rephrase:  Starting from the surface of Earth (or, better yet,
some atmosphereless Earth-sized rock) I immediately accelerate to a speed
which would maintain an orbit of, say, 150 miles, initially in a tangent
course to the curvature of the celestial body.  What happens, barring
unforseen variables?
flem
response 205 of 323: Mark Unseen   Nov 15 14:57 UTC 2000

As I understand (and I'm no rocket scientist either), an orbital velocity is
just an equilibrium, where the tendency to fall (due to gravity) and the
tendency to shoot away from the, say, planet (due to inertia) cancel each
other out.  Because of the way gravity works (inverse square law), the speed
necessary for orbital velocity depends on how far you are from the planet.
So, the speed necessary to orbit the earth at ten feet off the ground is
higher (gravity has more effect) than the speed necessary to orbit at 100
miles altitude.  
  So, your question.  If you accelerate to whatever speed would be required
to maintain orbital velocity at 150 miles altitude, then turn off your
engines, it would take time for you to ascend.  During that time, gravity
would accelerate you towards the earth, changing your velocity considerably.
If you didn't turn your engines back on, you would certainly leave a 
very large crater.  
janc
response 206 of 323: Mark Unseen   Nov 15 15:20 UTC 2000

A brief non-mathematical (and I think pretty intuitive) explanation of why
things stay in orbit is at http://www.wwnet.net/~janc/bestthings/square.htm
l

Another nice paradox:  You are in orbit around the earth.  Another space ship
is in the same circular orbit, ahead of you by 1/8 of a circumference.  You
wish to catch up with the other ship.  To do so should you (1) speed up or (2)
slow down?

The correct answer is to slow down.

If fire a blast from your engines to speed you up, you will start moving away
from the earth in an elliptical orbit with it's apogee (nearest point to earth)
at the point where you fired your engine).  This is a much longer orbit,
and you will wind up falling behind your target.  Slowing down drops you
into a lower, faster orbit.  As long as you don't re-enter (oops) you should
be able to catch up with your target on that orbit.

Visualize the model of a marble rolling around in a funnel.  Speeding the
marble up makes it go higher in the funnel, slowing down as it climbs, and
having a longer path to travel, slowing down makes you dip lower, speeding
up as you do so, and taking a shorter path.

Basic rule is that you don't fly a space ship by pointing it where you want
to go and hitting the gas, not unless you have really hellaciously large
amounts of fuel to burn and don't care how fast you are going when you hit
your target.
albaugh
response 207 of 323: Mark Unseen   Nov 15 17:10 UTC 2000

That scenario assumes that you can't alter your tragetory as you accelerate.
If you "point down" while speeding up, you can certainly close on your target.
other
response 208 of 323: Mark Unseen   Nov 15 21:31 UTC 2000

"tragetory"...?   s/get/ject
albaugh
response 209 of 323: Mark Unseen   Nov 15 21:56 UTC 2000

target + ory ?
drew
response 210 of 323: Mark Unseen   Nov 15 22:37 UTC 2000

On #205: If you accelerate from ground but don't circularize, you're in an
elliptical orbit with apogee at whatever altitude you reach and perigee at
ground level. Doing this from the Moon should be safe so long as there are
no mountains in the way. From any world with an atmosphere it's a slightly
different matter: in practice it's necessary to clear most of that atmosphere
which doing so puts you near if not at whatever altitude will suffice for a
low orbit.

Boosting forward or aft at orbit apogee raises or lowers, respectively, the
perigee, and vice versa.
drew
response 211 of 323: Mark Unseen   Nov 15 22:41 UTC 2000

Oh yes. And while I'm certain that russ shares the point of view, the
complaint about ships being pointed in the wrong direction half the time in
space movies/TV shows is most of the time mine.
brighn
response 212 of 323: Mark Unseen   Nov 15 23:51 UTC 2000

Saw BWII: Book of Shadows, and was pleased to learn that, in my case at least,
the inverse of the movie reviews also held. The movie's generic review has
been, "If you're going in expecting Blair Witch again, because you loved it,
you'll be disappointed." I thought Blair Witch was the biggest waste of
celluloid ever produced, and only went to BoS because (a) the teasers looked
good and (b) it was so thoroughly panned. It was very good, especially for
its genre.
rcurl
response 213 of 323: Mark Unseen   Nov 16 05:42 UTC 2000

Space ships in movies and TV (as well as the occupants) are almost always
oriented with respect to "up" and "down" as we experience it on the
earth's surface. I guess they don't want to make the viewers nauseous...
ric
response 214 of 323: Mark Unseen   Nov 16 18:14 UTC 2000

(The camera is upside down too, actually, so everything just looks right side
up :)
rcurl
response 215 of 323: Mark Unseen   Nov 16 22:07 UTC 2000

When a bunch of ships gather (such as, to come to another ships rescue, etc),
they are all right-side-up (oh, maybe a few are tilted this way and
that).
tpryan
response 216 of 323: Mark Unseen   Nov 16 23:12 UTC 2000

        In Wrath of Kahn, Spock mentions how Kahn is thinking in only 
two dimensions, and has the ship go relative down.  He then came up 
to shot at the thin profile of the oppenent.  All that had to be done
when hidden, was to also turn 90 degrees, to take aim at a big broad
, easy to hit saucer section.
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