cellio: (B5)
Monica ([personal profile] cellio) wrote2005-04-17 09:20 pm
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flights of fancy

"Existentially speaking, is there such a thing as half a piece of cake?" -- [livejournal.com profile] kayre

This evening at dinner the fundamental dynamics of lightsabres came up. Specifically, how does the color encoding work? Is Luke's blue because Luke prefers blue, or because any lightsabre Luke uses will channel Luke-specific force, which is blue? If so, do the admission criteria at Jedi University include "sabre does not glow red" (and if not, why not)? Are there important qualitative difference between blue and green sabres, both of which appear to channel the light side of the force? Surely these are important research topics for someone out there who has, you know, seen all the movies.

[identity profile] metahacker.livejournal.com 2005-04-18 01:35 am (UTC)(link)
It has to do with crystal alignment. Crystal alignment depends on personal philosophy of the maker. So...

(They kind of sort of cover this in one of the Zahn books, IIRC.)

lightsabres

[identity profile] psu-jedi.livejournal.com 2005-04-18 01:38 am (UTC)(link)
What I know I know because I did my 11th grade chemistry paper on the SPFX of Star Wars, and how things would work if they were for real. And since that was, um, 20 years ago (holy crap!), and we all know how Lucas likes to play with his own universe, it's possible that this information is completely out of date.

BUT,

lightsabres are built by each Jedi, essentially they have to get their "sabre badge" as part of their trials. Sabre color is dependant on what kind of crystal is used as the main componant of the hilt, or the thing that garners the energy. In extended universe (so I guess this stuff is kinda up to date), Jedi could be drawn to the crystal that they used to make their sabres (if memory serves, we see this in Vol 1 of Clone Wars which was on the Cartoon Network). If that's the case, then it would make sense that Sith are drawn to those crystals that make a red glow, and that Jedi are drawn to those that make blue/green/purple, etc. Of course, we didn't see the purple sabre until EPI. Luke's first sabre was Anakin's, which Obi Wan somehow has(we haven't exactly seen how Obi Wan gets it, but I'm hoping we learn this in EPIII). It was blue. That was lost when Vader chopped Luke's hand at the end of ESB. Luke shows up with a new, GREEN, sabre in ROTJ. Again in extended universe, there's a book called "Shadow of the Empire" that came out in '96 or something like that, that is set in the 3-month time preiod between ESB and ROTJ. There's a chapter about how Luke returns to Ben's hut and constructs his new sabre. I only read the book once because, well, it pretty much sucked (it wasn't written by Tim Zahn, god of Star Wars EU!), but I do recall that.

There's also talk (can't remember from where/who) that each color does have a different strength to it, but I can't really talk to that. What I learned when I wrote my paper was that a laser sword is pretty much fantasy. A laser doesn't end after a meter, and for swords to "cancel" each other (i.e., hit), they'd have to be of the same color.

For those of you out there with a science background, feel free to correct me on that. The only reason I passed chem that year was because I wrote 2000 words for the paper when all we were supposed to write was 1500. 50 points extra credit pushed me to a "B" in the class, even though I pretty much failed my final. I hated chem. I loved movies (and still do!). So, yeah.

This is probably more than you wanted. And I'm not sure if it even answered your question. But it's what I could come up without having to delve into source material (ahhh! Actual research! Ahh! ;-)
geekosaur: orange tabby with head canted 90 degrees, giving impression of "maybe it'll make more sense if I look at it this way?" (Default)

Re: lightsabres

[personal profile] geekosaur 2005-04-18 02:26 am (UTC)(link)
A laser doesn't end after a meter, and for swords to "cancel" each other (i.e., hit), they'd have to be of the same color.

In fact, there's no way known to (our) physics to accomplish either; the beams would (a) go on "forever" (or at least until they encountered an object, or ultimately until they finally diverged sufficiently) and (b) not be able to "hit" each other whether the same frequency or not. (And it doesn't help to invoke "force fields" to contain the beams; as far as our physics is concerned, they have precisely the same problems. In fact, a "force field" in real physics has essentially nothing to do with the SF concept. Magnetic and electrical fields are real-world physics "force fields", and the closest those get to the SF version is that, if strong enough, they can attract or repel non-ferromagnetic materials by interacting with particle "spins" (IIRC; "spin" not really being spin as we know it, but related to "magnetic moment") — which is how MRI scans work, among other things. Not quite what we're looking for....)

Of course, it's silly to argue this when they have even bigger contradictions of known physics, such as FTL travel. :)

Re: lightsabres

(Anonymous) 2005-04-18 03:10 am (UTC)(link)
The beams of a lightsabre are linked nanite superconducting robots. That's why they buzz and end at a certain distance.

When they cut through a body, they eat it.

Rob of UnSpace (http://www.unspace.net/)

Re: lightsabres

[identity profile] psu-jedi.livejournal.com 2005-04-18 03:24 am (UTC)(link)
Of course, it's silly to argue this when they have even bigger contradictions of known physics, such as FTL travel. :)

And let's not even get into the whole sound of Tie Fighters (and planets!) exploding cunundrum!
sethg: picture of me with a fedora and a "PRESS: Daily Planet" card in the hat band (Default)

Re: lightsabres

[personal profile] sethg 2005-04-18 12:56 pm (UTC)(link)
The sounds of the explosions are generated by the X-Wing fighter's navigation computer. When the sensor array detects an explosion, the computer generates the appropriate sound in the pilot's headphones, so the pilot can tell where the explosion was without taking his eyes off his targets.

[identity profile] goldsquare.livejournal.com 2005-04-18 01:45 am (UTC)(link)
Monica? It's so you can tell them apart on screen.

:-) :-) :-)

[identity profile] patsmor.livejournal.com 2005-04-18 02:18 am (UTC)(link)
All Hail Blade Edwards' Skin Deep with John Ritter.
ext_4917: (Default)

[identity profile] hobbitblue.livejournal.com 2005-04-18 02:16 am (UTC)(link)
Is it too dull to say that Samuel J's is purple because he asked for it to be purple? Which I think is rather cool, personally :)

[identity profile] psu-jedi.livejournal.com 2005-04-18 03:25 am (UTC)(link)
Not at all! SLJ is THE man!

[identity profile] grouchyoldcoot.livejournal.com 2005-04-18 03:59 am (UTC)(link)
If you had a meter-long, extremely strong fiber of some material which was extremely transparent to light of a particular wavelength, you could set up a very intense standing wave inside the fiber. The photon pressure would hold the fiber rigid, and the evanescent wave (basically leakage) would carry some energy outside the fiber. If something like air entered the evanescent wave you'd get scattered photons. If something denser, like a slow jedi, got close enough to interact with the evanescent wave, it would get very hot very fast.

That's my favorite light saber theory. It's only 90% physically impossible, rather than the traditional 100%.

[identity profile] akitrom.livejournal.com 2005-04-18 03:22 pm (UTC)(link)
By the way, there are two such things as half-a-piece of cake.

One requires the other half to still be attached. "There's still a couple of letters in the icing on the right half of this piece of cake."

The other definition is temporary and locally defined. (All language is locally defined. All language is jargon.) If you've cut a cake into pieces of a certain size, then the temporary, local definition of "piece of cake" includes both the type of cake (chocolate, or what have you) and the size of the piece. "I only want half a piece of cake" uses this local, temporary definition, as a short-cut for the more lumbrous "I only want a piece of cake half the size of the one's you've already cut for people."

The more important question is whether people in your part of the country "ice" a cake or "frost" a cake with the thick chocolate liquid sealant.

[identity profile] dvarin.livejournal.com 2005-04-18 05:45 pm (UTC)(link)
If the other half is still attached, doesn't it make it all one thing? I was under the impression that for the purposes of referential sanity, most people didn't allow the division of connected consistent solid objects up into an arbitrary number of virtual "things".
If you want to refer to the halves separately, it would seem that one half would need to be in a different context than the other, like if it were on the other side of a dimensional rift, or covered with a handkerchief and invisible, or something. That would provide a situation where it would be natural to refer to one half independently of the other, so it would consist as the entirety of one thing.

[identity profile] ralphmelton.livejournal.com 2005-05-05 10:09 pm (UTC)(link)
This doesn't answer your question, but it amused me: http://electronics.howstuffworks.com/lightsaber.htm