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Can anyone explain Interstellar Questions?

  1. Dec 15, 2014 #1
    1.Coop lands on coop station at saturn, but why he returned to saturn instead of earth?
    2.how Murph is at coop station at saturn, but murph actually stays on earth, but how she present on coop station which is at saturn?
    3. how coop send Morse code through wrist watch just by clicking back side of library books, & also what is the use of sending Morse code?
     
  2. jcsd
  3. Dec 15, 2014 #2

    jedishrfu

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    The ending was rather confusing. I think humanity figured out how to escape the earth. Murph had solved Dr Brands problem and thus created an ark to escape to Saturn and the next stop would be to send people through the wormhole to a new world.

    In the beginning of the movie, Murph tells her Dad that someone is communicating with her telling to stop her Dad from going. In the end, we find Coop trying to send that message by pushing out the books because he wished he never left her behind. Then he realizes he can save her so he sends the data on what it's like inside a black hole by morse code that she can then use to complete Dr Brands work.

    There's a good book by Kip Thorne called The Science of Interstellar that goes into some of the science and speculative ideas that shaped the movie and why the director did what he did for the story to flow.
     
  4. Dec 15, 2014 #3
    why the houses at coop station on saturn are in the shape of "O'Neill cylinder"?
     
  5. Dec 15, 2014 #4

    jedishrfu

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  6. Dec 15, 2014 #5

    Drakkith

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    1. Because there's a space station at Saturn. The return trip to Earth would take something like 2 years. Better to pick him up and treat him at the space station.
    2. Murph doesn't stay on Earth. She goes to Saturn. The end of the film is about 80-100 years after Coop first left Earth, and about 40-60 years after Murph gets the Morse code message from Coop while on Earth.
    3. The film doesn't show it very well, but Coop is directly manipulating the watch's second hand. If I remember correctly, you can see a slight "blur" going from the watch up to Coop's hand, showing that he's manipulating it. He's using Morse code to send the data gathered on the black hole to her, allowing her to develop a quantum theory of gravity, which apparently is what is needed to save Earth. (Can't remember why exactly)
     
  7. Dec 15, 2014 #6

    DaveC426913

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    It allowed them to lift whole populations and industries into space where they could rebuild Humankind without the threat of the plague that consumed Earth. The NASA base on Earth was actually an entire space habitat ready to be lifted into orbit and populated - if they could solve the gravity problem.
     
  8. Dec 15, 2014 #7

    Drakkith

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    Ah yes, now I remember Coop looking at the place sideways.
     
  9. Dec 16, 2014 #8
    The wormhole to the Gargantua system has a mouth near Saturn.

    By spaceship, and presumably one a lot faster than the rocket ship Cooper took.

    Through a gravitational signal transmitted backwards in time.
     
  10. Dec 16, 2014 #9

    Drakkith

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    I don't think that's what happened. From what I remember, Coop was in some sort of 5th dimension where he could move to different points in time. No signal was transmitted backwards in time because he was really present at that point in time.
     
  11. Dec 16, 2014 #10

    ShayanJ

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    That's not the idea. Just making the universe 5 dimensional doesn't let you to be able to travel to different times that easily. For doing that, you need to be in a manifold in which our universe is embedded in. Something like seeing a 2 dimensional surface in 3 dimensions. But I can't remember a theory suggesting our universe is embedded in a higher dimensional manifold. Although this can't be an objection to the film but is in contrast with their insistence on getting all the ideas in the film from physics. Or maybe there is such a theory and I've never heard of it!
    EDIT:Isn't it Tegmark's multiverse?
     
  12. Dec 16, 2014 #11

    Drakkith

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    I don't know where exactly they got their ideas from, but I remember them talking about the 5th dimension and about using it to move along the timeline.
     
  13. Dec 16, 2014 #12
    Coop wasn't "in a 5th dimension." He was in a device that permitted him to perceive light from certain events in the past and transmit gravitational signals with amplitude in a 4th spatial dimension (along a path that would intersect approximately with the light-transmitting event). This is described in Chapter 30 of Kip Thorne's book.
     
  14. Dec 16, 2014 #13

    Drakkith

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    Okay. But was this in the movie?
     
  15. Dec 16, 2014 #14
    Yes. In fact, aside from the depiction of Gargantua, I thought the depiction of the tesseract device and its operation was one of the more pleasant surprises.
     
  16. Dec 16, 2014 #15

    Drakkith

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    I mean was the explanation you gave also the one given in the movie. I only saw it once and can't remember all the details.
     
  17. Dec 16, 2014 #16
    There's no dialogue or obvious signage explaining what's depicted, as I recall.
     
  18. Dec 16, 2014 #17

    Drakkith

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    Ah okay. No wonder what you said wasn't matching up with what I remembered. Although I think I remember Coop talking about someone constructing it for them. I assumed that he was *in* the 5th dimension, but I guess that's just silly!
     
  19. Dec 16, 2014 #18
    The key point is that the depiction is consistent with what Kip Thorne described, and according to Thorne that is precisely what Nolan intended.
     
  20. Dec 18, 2014 #19
    I have watched it.
    Start with the bad things, there are a number of them, so i understand those who disliked the movie.

    They could construct an artificial biosphere in space, werent building domed cities on Earth enough to save humanity?
    My knowledge is limited, but IMHO manuevering in the gravity well of a black hole requires hell of delta-V, that would have been enough to evacuate millions of people from Earth.
    Why couldnt they stretch that wormhole to Earth, simply connect it with another life support planet?
    Ok fall inside the event horizont sounds really mystical, but making tons of experiments in a wormhole is the second best thing... but they havent even mentioned it.
    Why were they so ready to believe that the ice planet without breathable atmosphere will be just fine for a colony? Then a Mars colony would have been also enough.
    I think Anna's speech about love as a physical force... was a bit overforced.

    On the other hand, it was a really well written film with good points and scenes, i have enjoyed it, i could suggest it anyone with a certain amount of suspension of disbelief. :)
     
  21. Dec 18, 2014 #20
    Several possibilities, ranging from "terrestrial agriculture is too far gone" to "man beats blight, starts farming in space to better hedge his bets."

    Science of Interstellar proposes that Endurance used gravitational slingshots to plod around the Gargantua system. Thorne proposes a system of at least 5 intermediate mass black holes in the book. Cooper makes an off hand reference swing off a neutron start in the movie. Reconciling the two or coming up with more consistent explanations is left as an exercise to the viewer.

    Presumably because they lacked the know how and means to do so.

    Perhaps they did, and didn't discover the missing piece of the MacGuffin in the attempt.

    Several reasons non-exclusive reasons, including but not limited to:
    1. Mann lied, so they had no idea. Nor would they without approaching the world in the first place (due to time dilation).
    2. Planetary chauvenism. We have experience with this today with all the Marshot lunacy. Fortunately, by the end of the movie, Americans at least have expanded their horizons a bit.

    I thought it was beautifully shot down by Cooper, with the icing on the cake being that final shot of Anna stranded and alone over a grave while the rest of mankind enjoys luxury digs in massive space habitats.

    For a more enjoyable experience, don't suspend disbelief. Take it as a challenge to square the film with what we know to be plausible. That's my take, at least.
     
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