Interstellar and intergalactic travel

Discussion in 'Astronomy, Exobiology, & Cosmology' started by Norsefire, Jan 4, 2008.

  1. cosmictraveler Be kind to yourself always. Valued Senior Member

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    :

    :crazy: :wallbang: :wtf:
     
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  3. Gustav Banned Banned

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    you appear to have a time frame?


    you know what , discount the question
    aint interested
    lemme look at your prior posts
     
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  5. orcot Valued Senior Member

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    You lost me somewhere?

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    to cosmic traveler:
    people don't like nuclair energy in space yust look at the newsreport when cassini made it's earth fly by with it's 10 kg or so plutonium
     
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  7. kmguru Staff Member

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    Just call it Orcot alloy....

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  8. cosmictraveler Be kind to yourself always. Valued Senior Member

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    Scientists don't like saying things that can't be done either. Orion is not what most scientists envision as a good way to travel. Orion just isn't a good idea to many people not because it is nuclear but because it won't work.
     
  9. oreodont I am God Registered Senior Member

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    There is no reason to go to Alpha Centairi as far as we know....no planetary system. Also, re the time to travel there....it takes as much energy to slow down a craft as accelerate. A craft needs to take energy to slow itself but that energy has mass in the form of storage (nuclear devices). But then you need MORE fuel to accelerate the increased weight and, then of course, MORE stored energy to slow it down. It becomes an impossible amount of energy just to accelerate and slow an object of more than a few grams..every extra gram exponentially increases energy needs as does every incremental increase in speed.

    bottom line: We ain't going anywhere soon.
     
  10. cosmictraveler Be kind to yourself always. Valued Senior Member

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    We can IF scientists can make a usable wormhole. Like in the movie "Stargate". They are trying to do so now with many experiments into the particle physics world. People must stop thinking about the "old" ways to travel and become aware of other possibilities and methods of space travel. Once humans evolve past solid fuels to move through space with then they can start to realize that there's faster and easier ways to do so.

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  11. kmguru Staff Member

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    One way, we could do this is shown in Carl Sagan's Contact. Once we establish a remote connection with an alien civilization that basically looks the same and scienctifically as advanced, we will teach them (or they will teach us) how to build a stargate. Then two are connected....trade can take place.

    I make a bet here: Our first contact will be a group that evolved directly from the dolphins but look somewhat human - in 180 years.
     
  12. cosmictraveler Be kind to yourself always. Valued Senior Member

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    You could just send through a remotely controlled Stargate to wherever you want then it could automatically turn itself on to accept travelers through it wherever it is.

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  13. Fraggle Rocker Staff Member

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    Robert L. Forward, a recently-deceased physicist who wrote "hard" sci-fi novels, built a plausible scenario for getting to Barnard's Star, which is a bit further away than Alpha Centauri but has planets, in about fifty years. The technology is a solar sail, a gigantic, thin membrane that collects photons from the nearest sun and converts them into energy to generate continuous acceleration. At the beginning of the voyage a focused light-beam from a huge lens built in space would provide an extra burst of power.

    Solar sails have been discussed on SciForums (and obviously elsewhere) and I gather that the problems with Forward's hypothesis are:
    • It's difficult to protect the occupants of the spacecraft from the unfiltered radiation in outer space, without making the craft as massive as a skyscraper, and
    • There's a limit to how big the solar sail can be, without being torn apart by solar winds.
    Therefore the largest practical interstellar craft that could use this technology would have a payload of a few kilograms,

    Still, that's plenty of room for a computer with a bank of instruments and the means to communicate with us. A four-year time delay would not detract from the value of the pictures and other data it sends back. And Bill Gates and Warren Buffet could launch several of these on their own, without having to convince the voters that it's a good use of their tax dollars.

    It makes sense to me, to first find a planet that we could land on, or better yet one with life, or better still one with a civilization. THEN we can use the technology we've devised in the meantime to figure out how to get people there safely.

    It could still turn out that the nearest destination worth the time and trouble is a couple of hundred light years away and takes a millennium to reach. In that case we have to either have perfected suspended animation, or else take the unknown risk of a generation-starship.
     
  14. Dinosaur Rational Skeptic Valued Senior Member

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    KmGuru: That looks like a safe bet. How do I collect if you are wrong?
    I do not figure to live more than 20 years (if that long), and I am sure you will not last another 180.

    What makes people think that dolphins are so smart? Analyze the history of the only intelligent species that we know about. It looks to me like you need a hand (or similar apendage) with at least one opposing thumb (probably not more than two) and 2-6 fingers.

    The ability to pick up and use a tree limb or a rock is the precursor to developing the intellignence to improve on a naturally occurring item and then go on to actually designing & making a tool.

    Intelligence does not sudenly occur due to magic. It is a slow evolutionary process starting with a hand-like appendage.
     
  15. kmguru Staff Member

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    That is your problem. May be give the bet to your children who will contact my children?

    As to Dolphins...either we may tinker with them by infusing our DNA (remember the guy who was having sex with a bicycle, we humans have a basal urge to stick it where we do not belong) or they were already tinkered by somebody else.

    Just because we are away from the bitten path in the Milky Way,does not mean, others can not find us....

    BTW: How sure are you that we were not tinkered by an external specis? The answer to that will soon come from the Genetic Tinker labs....
     
  16. kaneda Actual Cynic Registered Senior Member

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    kmguru. I think the structure of space itself prevents anything moving faster than light speed. If you could somehow circumvent space, as in hyperspace, you would still need a drive capable of propelling you somehow at FTL speeds. I have said elsewhere why wormholes will not work.

    I think this is like asking someone 200 years ago how we could journey from Britain to America in 5 hours. Such a person would not have a clue about Concorde so would imagine some sort of huge clipper with lots of sails on. I think we are in that position at present where we literally have no idea how FTL travel will be accomplished.
     
  17. superluminal I am MalcomR Valued Senior Member

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    100% agree.
     
  18. kaneda Actual Cynic Registered Senior Member

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    orcot. Quantum Entanglement involves imparting spins to two particles so that they "effectively equal one" so that if you read one spin, you can then know the other spin. It has a use in hiding data and such but not in travel.
     
  19. kaneda Actual Cynic Registered Senior Member

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    There was whining in the early sixties about polluting space with radiation

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    but I think what serious people were worried about was the real danger of such a craft failing to reach and leave Earth orbit and falling back onto a populated area, spraying radioactive material far and wide.

    I don't think Orion is going to get us to the stars but it may prove viable for it's original intention when it was said it could get a few dozen men and a thousand tons of supplies to Mars within a month. Possibly some improved form of ion propulsion will do, but it will still be a very long voyage as such ships take years to reach a good speed before a ramjet then takes over and builds up some real speed.
     
  20. kaneda Actual Cynic Registered Senior Member

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    If wormholes exist, you are talking the energy/gravitation of a black hole to make something which may work for just a few miles. A wormhole which would bend space for light years is whole galaxies worth of energy/gravity.
     
  21. kmguru Staff Member

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    I agree. However the space itself has certain properties that may be subject to manipulation. For example, if nothing can move faster than light then how come space does. The space itself is expanding faster than light.

    I agree again. I am always cognizant of that fact and hence look for other ideas not invented yet. I used to teach Creativity in colleges. But that was not a big hit, because students could not invent time machines after the class, even though I had good feedback on the class.

    We may not come up with a Concorde, but primitive people knew that if birds can fly, may be someday, humans can too. The way, new products are developed is when inventors make the leap of faith...that what-ifs, within the basic understanding of base science. One should not say, gravity will not allow us to fly or travel to Mars...one should say "How can I"...

    In my years of being a scifi member, only 3% to 4% indulge with my and others speculations. Rest jump in saying it can not be done. Inventors usually are not among those 96%.

    I understand what you are saying....hence let us dream how those far out ideas are possible.
     
  22. orcot Valued Senior Member

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    shall we call that kmguru alloy
    You mean somewhere from earth itself? No intiligent life can evolve in such a short time and we do not need a 180 years to make one with genetic manipulation or cloning extinct ones back.
    I believe anything in the homo class will be recreated in under a 100 years from now gowing from homo habilis, erectus, neanderthals and some of the ones in between. All of them will be far smarther then all life on earth except humans and some of them might be worth being called truly intiligent.
    Power sortage your probe could never send it's data back to earth. And in it's 100 year voyage space telescopes would be developed that are far better and have the obvious advantage that they can study stars for several years in stead of weeks/months like with a stellar flyby.
    True but did I say something abouth travel? If you read the post it yust says that certain quantm effects can be increased to a bigger size under certain conditions.
     
  23. kmguru Staff Member

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    Why not? Every other alloy has a name.

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