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Old 2017-02-05, 07:07   Link #1
Draco Spirit
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Faster than Light travel methods?

I was playing Steins:Gate the other day and interesting point came up in regards to time travel. That if you went back to the exact same spot one second in the past, you would have moved great relative distance because things like the earth, the solar system and the galaxy are all constantly moving.

Out of curiosity has there ever been any serous theories or explorations of using this point for effective FTL movement?
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Old 2017-02-05, 22:16   Link #2
quigonkenny
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Quote:
Originally Posted by Draco Spirit View Post
I was playing Steins:Gate the other day and interesting point came up in regards to time travel. That if you went back to the exact same spot one second in the past, you would have moved great relative distance because things like the earth, the solar system and the galaxy are all constantly moving.

Out of curiosity has there ever been any serous theories or explorations of using this point for effective FTL movement?
Velocity is relative within its frame of reference, so it only really matters if there's a sizable difference in relative velocity between your starting location and your ending location. Besides, the velocities involved in the motion of the earth, solar system, and galaxy are so much lower than that of the speed of light that they're little more than rounding errors. That's something that is definitely considered in real astronautics, like for the New Horizons mission to Pluto, for instance, but never really makes it into the stories because frankly, math is boring to most people. I doubt you're going to see much mention of it in fiction, either, for the same reason.
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Old 2017-02-06, 01:47   Link #3
OH&S
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I remember back in my uni days i attended a special physics lecture about coming up with ways to travel FTL. One of the interesting ideas that they talked about was taking advantage of the fact that matter bends spacetime. The idea being that you could bend spactime in such a way that the spaceship would be able to travel on wave of sorts. The wave would then travel FTL even though the ship's local speed wasn't.

The problem came when trying to solve the equations for the mass that would allow this to occur. The simple solution always lead to negative mass! There was no known positive solution because it was too difficult to solve. But obvously since we're talking bending spacetime it would be significant.
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Old 2017-02-06, 19:39   Link #4
Dop
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Quote:
Originally Posted by Draco Spirit View Post
I was playing Steins:Gate the other day and interesting point came up in regards to time travel. That if you went back to the exact same spot one second in the past, you would have moved great relative distance because things like the earth, the solar system and the galaxy are all constantly moving.
This is why TARDIS stands for Time And Relative Dimension In Space!
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Old 2017-02-07, 14:46   Link #5
quigonkenny
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I thought it was because that's the best they could come up when backronyming TARDIS.
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Old 2017-02-07, 15:22   Link #6
GDB
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According to wikipedia, the acronym is fully stated in the very first episode.

Quote:
There is some disagreement over whether the "D" in the name stands for "dimension" or "dimensions"; both have been used in various episodes. The very first story, An Unearthly Child (1963), used the singular "Dimension". The 1964 novelisation Doctor Who in an Exciting Adventure with the Daleks used the plural "Dimensions" for the first time and the 1965 serial The Time Meddler introduced it to the television series, although for The Time Meddler, actor Maureen O'Brien changed it to the plural form after the definition was scripted in the singular form.[3] Since then both versions have been used on different occasions; for example, it is singular again when mentioned in Frontios (1984). In "Rose" (2005), the Ninth Doctor uses the singular form (although this was a decision of actor Christopher Eccleston—[4] the line was scripted in the plural).[5] Likewise, the Tenth Doctor keeps the word firmly singular in "Smith and Jones" (2007). The plaque set on the TARDIS console in the 2010–12 design also uses the singular form. The 2011 episode "The Doctor's Wife" further establishes the singular as definitive by having the TARDIS herself use "Dimension" when uttering the full meaning of the acronym. In "The Zygon Inversion" (2015), Osgood mentions hearing "a couple of different versions" of what TARDIS stands for. The Twelfth Doctor responds with an entirely new acronym that he came up with from the initials, "Totally and Radically Driving in Space".
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Old 2017-02-11, 06:19   Link #7
Vallen Chaos Valiant
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Time Travel is effectively the next step after FTL travel. Mainly because FTL travel would cause some degree of time travel as a side effect, in theory. And that Time Travel then meant you took control of that.

The issue of course, is that we haven't observed either of these things happening.

If there is somehow a way for FTL travel to happen in nature, we would have been able to observe it and use it in our own technology. Same with time travel, it is something that we dreamed up but not observed.

It is much harder to invent something from scratch, rather than just observe existing phenomena and imitate.
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Old 2017-02-11, 18:55   Link #8
quigonkenny
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Add to that the fact that FTL travel is pretty much unobservable except by instruments. It's easy enough to observe the result—that something moved from point A to point B faster than light should be able to travel—but actually seeing that movement, considering the medium you need to see it is moving slower than it is, is a bit more difficult...
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Old 2017-02-11, 19:29   Link #9
Rising Dragon
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FTL is pretty much impossible. It's basically the physics equivalent of dividing by zero--it can't be done. You can thank Einstein for taking it from us, and thermodynamics for keeping it away from us. The closer you get to light speed, the amount of energy required for it increases by an infinite amount. As such, time travel is also impossible. The universe has mechanics in play that will make sure it won't work.
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