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- From: maynard@jmg.com (J. Maynard Gelinas)
- Newsgroups: alt.alien.visitors,alt.paranet.ufo,alt.alien.research,sci.skeptic
- Subject: Re: Falsifying the Extra-Terrestrial Hypothesis
- Followup-To: alt.alien.visitors,alt.paranet.ufo,alt.alien.research,sci.skeptic
- Date: 21 Jun 1996 22:48:10 GMT
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-
- Jim Rogers (jfr@fc.hp.com) wrote:
- : George H. Pink wrote:
- : > >Brian Zeiler <bdzeiler@students.wisc.edu> wrote:
- : > >Patrick Juola wrote:
- : >
- : > >> Certainly, ETH proponents seem willing to calmly
- : > >> assume FTL transportation
- : >
- : > >That's hogwash. FTL travel is not a necessary condition for
- : > >extraterrestrial visitation.
- : >
- : > I would agree. Faster than light travel is not a necessity. If the
- : > star was within 20 light years, and these "beings" were travelling at
- : > 33.3% the speed of light, it would would take them 60 years to travel
- : > here.... is this not feasible? If they were travelling
- : > at 66.6% the speed of light, it would take them about 40 years
- : > and going 99.9% spped of light, without violating any of our laws
- : > it would take them 20.2 years. It it unimaginable over long
- : > distances, but with short distances, it is possible.
- : ....
-
- First, I think you're forgetting about reference frames here. At
- ..9999c, travel from one star to the next - say 20 light years - would
- indeed take somewhere around 20 years for those in the nonaccelerated
- reference frame. For those on the ship, however, I think we could safely
- say that the travel time would take x amount of time to accelerate to the
- close to c speed, a coasting period at near light speeds, and then x
- period of time while decelerating. The amount of distance traveled would
- be greatest during the close to c speeds, at this high rate of speed those
- in the high acceleration reference frame would experience a time
- distortion which would enable them to experience a *very* quick trip to
- their destination. This is well documeted both in Hills' book and
- elsewhere. I'm not a physicist, but I feel fairly certain that this is an
- accurate assesment of current relativity theory.
-
- So, to sum it up, if one could accelerate at a high rate of G
- force, say 100 Gs, the trip could conceivably take a very short period of
- time for the travelers. For their relatives back at the homeworld, time
- would not distort in the same fasion, and the travelers would have to
- reconcile the fact that well over fourty years (20 light years each way,
- plus acceleration times, and deceleration times for each trip, AND the
- amount of time taken to perform whatever tasks were desired at the
- original destination) would pass before their return.
-
- : And just how would you propose attaining such speeds, with any payload
- : of reasonable mass? There is no way you can avoid action/reaction, which
- : implies you have to push against *something* in order to move; rockets
- : push against their ejected reaction mass. How much reaction mass would
- : you need to carry, and how fast would you have to eject it, to reach 1/3
- : the speed of light (don't forget that the reaction mass you start off
- : with has to be accelerated right along with your payload), and how much
- : to slow to a stop once you get there (hint: work backwards)? What energy
- : source would you posit can generate the reaction mass ejection speed you
- : need? If you're not going to use a rocket, what are you going to push
- : against, and how? (There *is* hydrogen in the 'vacuum' of space, but
- : it's extremely thin and you still need a way to collect it and the
- : energy to accelerate it).
-
- : Sure, there's no *relativistic* theory blocking you here, there's just
- : plain ol' kinematics getting in the way. You can't just wish high-speeds
- : into existence-- you need to provide a force to accelerate you.
-
- Hill posits using a photon beam engine for long distance travel.
- Yes, the amount of energy needed for such a device is, with our level of
- expendable energy, quite impossible. But now we're arguing about energy
- availability and engineering problems, not the basic science which would
- make such a craft *possible*. A photon beam engine would expell particles
- at light speed, which could conceivably push a solid mass at near light
- speeds. I agree that there is no need to demand FTL travel for functional
- interstellar travel. The engineering problems, well, that's another
- issue.
-
- : And there's another major 'engineering' problem to deal with: collisions
- : with micro-asteroids at tremendous speeds; a grain of dust would hit you
- : with the impact energy of a very large bomb at 1/3 c.
-
- Yup. You're absolutely right about this. One little impact and
- - BOOM! - you're space dust. I don't really know what to say about this,
- nor do I know how to store the required energy on the craft to maintain
- the acceleration force. As to how occupants on a craft could sustain a
- 100g force - well, there's another problem, without anti-gravity. Let's
- drop *that* discussion for now ;-).
-
- Here is one concept for *real* light speed travel. Suppose you
- had a functional Molecular Nanotechnology that you could move from one
- place to another at near light speeds (or even at slow speeds, it just
- needs to get *there*) That is, you could create a craft which would
- transport self reproducing Nanotech from one place to another over a
- considerable distance. Once your ship arrives, you could transmit the
- information necessary to build whatever you wanted at the other end *at
- light speeds* and then rely on the nanotech to build a short range craft,
- and its occupants, at the other end. Such technology is being debated in
- sci.nanotech right now, by followers of such proponents as K. Eric
- Drexler. Again, no matter is traveling at light speeds, just the
- information necessary to manufacture the desired complex forms at the
- other end.
-
- Your thoughts?
- jmg
-
-