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Space Science

Speculations on a Moon Colony 121

Buggernut writes "As reported by the BBC, humans could be living on the Moon within 20 years, according to a leading lunar scientist."
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Speculations on a Moon Colony

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  • Just after I get my flying car!
    • by uncoveror ( 570620 ) on Thursday August 21, 2003 @12:41PM (#6756493) Homepage
      Permanent human colonies on the moon? We like to think of it as our moon, but the Zhti Ti Kofft [uncoveror.com] already have a base there. We are not powerful enough to force them off, and probably won't be in 20 years either. There is just no way they want to peacefully co-exist with us. After all they invaded during the balckout. [uncoveror.com]
    • A moon base is possible, but not in the sense that most ppl think .
      Sending ppl up there is just cost prohibitive .

      But if you think a little like Isaac Asimov, then sending
      robots makes perfect sense .

      You send small robots up there that can be remotely controlled
      from earth, and have Xmit/Rcv stations at different locations
      around the globe .

      You bring in several countries and even companies on the project,
      split the costs, and write a agreeable charter .

      One country footing the bill imght be high, but if 10 d
  • Deja vu (Score:5, Insightful)

    by Spudley ( 171066 ) on Thursday August 21, 2003 @11:53AM (#6755973) Homepage Journal
    Fourty years ago, when the Americans were graring up for their first moon missions, the 'pundits' made exactly the same predictions.

    Today it's the Chinese, but it all seems very similar.

    Sure we've got better technology now, but will that really make the difference? Lunar colonisation will only happen when there's political will to see it happen, and frankly, I can't see the conditions being right for that for some time.
    • Re:Deja vu (Score:4, Interesting)

      by Lshmael ( 603746 ) on Thursday August 21, 2003 @11:20PM (#6762056) Homepage
      Well, I think the Chinese (and maybe Indian) governments *do* have the political will to go to the moon and stay there. By going to the moon, they send the world the message that they are just as capable a superpower as the United States. By staying there, they are doing something the American government cannot - or will not - do.
      • Excellent! So by the time we Americans get there, our lunar Walmarts will be fully stocked with cheap Chinese goods, and there will be a 7-Eleven in every major crater.

      • I think all the Americans that think colonizing Mars is a good idea should attempt to colonize the Gobi desert instead. It's alot like the surface of Mars ... BUT YOU CAN BREATH THE AIR!!! Cripes, if the Chinese are willing to go all the way to Mars instead of colonizing the wasteland in their own backyard then America should explore there and spend the money they'll save on better observatories and robotic probes.
    • Re:Deja vu (Score:3, Interesting)

      by adoll ( 184191 ) *

      Typical BBC (and CBC, ABC, SABC, PBS) drivel that only the almighty Government can make something happen, and those mindless voters must be made to see reason. [www.cbc.ca]

      Want space colonization? Try a gold rush... it worked in California, Yukon/Alaska, Australia (Vic), South Africa, and is currently populating parts of Brazil. So what do we need to start this gold rush?

      First of all, higher commodity prices [bigpond.com] for things we'll find in space (metals, diamonds, power, etc). All these things are presently better provi

  • Can I buy some land there? :)
    • Re:Nice (Score:3, Funny)

      by kinnell ( 607819 )
      Can I buy some land there? :)

      Certainly. I'm currently selling plots at $10/sq.m (earth view), or $8/sq.m on the far side. I'm prepared to negotiate a discount for lots of 1000sq.m and over. How much do you want?

    • Yeah, you just have to homestead it.

      5 years there as long as you don't leave.
    • I'll have to talk to Russia first, maybe I can buy some of their power when they finish their powerplant.
    • Re:Nice (Score:3, Funny)

      by luvsbway ( 638311 )
      After you purchase your land there I've got some swamp land in Flordia for sale. Real cheep.
    • Yup! I got mine right here [spaceformusic.com]! It's approved by Dennis Hope [scifidimensions.com] (the owner of the moon) and all! Wooo!
    • Indeed, I own several thousand acres on the moon and on Mars - complete with deeds, mineral rights, and platts of the property. Check out lunar property and other info at http://www.lunarrepublic.com/info/toward.shtml Just because it CAN be done doesn't mean it WILL be done - but I'll rent them a site to put their dwellings on ... or under...

  • I think it would be technologicly feasable to have people living on the moon in 20 years, but I don't think there will be a financial inscentive for the huge cost.
    • There are several reasons why someone might want to set up a base on the moon.

      Because the moon has lower gravity, it would make an ideal space station.

      The moon has a higher content of metals than the earth's crust. Plus, you can dig up entire craters and no one will notice. You can set up low-G manufacturing processes, dump all the waste chemicals into the moon, and no one will care.

      Because the moon is on top of the earth, it is really easy to launch attacks on the earth from the moon with missiles or bombs. Whoever can get the hardware on the moon first will dominate the entire earth.

      The problems outweight the costs. There's the whole problem of radiation. Solar flares release enough dangerous radiation that it would kill anyone who stayed on the moon's surface for an extended period of time. We would need a lot of shielding to protect us from it, more than is reasonable to manufacture at this time.

      Also, launching stuff into space is one thing, but it is more expensive to get it to the moon and back.

      When these two problems are solved, then you may see people beging to establish bases on the moon.
      • Don maufacture shields, a big shield is already there. Just dig big holes.

        Solution to second problem is left as an exercise to the /. reader. Several hints may be found on google.

      • flares release enough dangerous radiation that it would kill anyone who stayed on the moon's surface for an extended period of time.

        Correct me if I'm wrong (which I very well may be), but I thought that the moon was well within the earth's magnetosphere. The only problem was that it didn't have an atmosphere to block out certian radiation.
      • Forget missiles and bombs, just lob big rocks. Gravity will do the rest, once you give it a small push. A moon base could be a powerful weapon in the future... let's hope our first colonies on the moon are for peaceful purposes.
      • For shielding, the human inhabitants once they arrived
        would need to largely live underground .

        Several hundred feet underground in circular tunnels
        similar to those going under the english channel .

        The cost of tunnelling has dropped due to projects
        and tech derived form it like "The Big Dig" in Boston .

        The moon base should be built by robots running off
        a Solar array set up on the moon, by said robots .

        The robots need to be able to diagnose and troubleshoot
        each other, and repair each other .

        Like a linux cl
      • Accually in a way we have the tech to return to the moon.
        Take a shuttle stack remove the orbiter and place the SSMEs on the ET what you get is a 100+ton launcher that will cost 300million a flight.
        The frist thing before sending people would be first send permanmt orbital communication sats then send remote vehicals to explore for then to process raw materials and water ice at the poles.
        Once that has been done send the first habitats and people.
        With raw materials and water you have a reliable source of oxyge
    • A 20 year span of time now seems to cover much more technology and social changes than that same time span in the past. 20 years of social, political, technological, and economic change back in the 1700s was negligible. 20 years today is like a century or so of change. Hence, who's to say what will happen in 20 years. I'm thinking of just 10 years ago and how much has changed. 20 years...I think we could have people up there. Without a doubt. Globalization is in full effect and if it's not one of the curren
    • A VERY large robot built telescope on the darkside of
      the moon that could lease out time to scientists on the
      surface with a digital microwave link of the data .

      The keck telescope had to use a multipart mirror due
      to its sheer weight, on the moon the gravity is MUCH
      less and a larger lense is feasible .

      The near zero light pollution on the darkside of
      the moon would provide great imagery .

      The moon having nearly no atmosphere helps that as well .

      Robots mining the raw materials and building it there
      could build
  • by PeteyG ( 203921 ) on Thursday August 21, 2003 @11:55AM (#6756002) Homepage Journal
    it will be China or India. The United States seriously lacks the resolve (or the infrastructure) to go to the Moon.

    Maybe 20 years from now, we'll be surpassed in space and get shamed into exploring again.
    • What infrastructure would that be that India or China has that the US does not have?
    • by burns210 ( 572621 ) <maburns@gmail.com> on Thursday August 21, 2003 @03:39PM (#6758577) Homepage Journal
      It seems odd that we can spend 400 billion dollars on defense in a year, but not have NASA be doing 10x the work they do now....

      Why can't we spend 20 billion less (what is that, a couple stealth bombers?) and get:
      *NASA sending a probe a month to mars, or the OTHER 7 PLANETS
      *build a better ISS.
      *colonize the moon
      *colonize mars
      *put a big honkin telescope(or an array of them!) on the moon/mars.
      *mine moon/mars for resources(water, building materials?, ore???)
      *have a launchpad on the moon, since it would be less fuel intensive to launch from there
      *build a space shuttle that kicks ass. that can easily takeoff/land/look cool without needs major repairs after every mission.
      *or...

      those might not seem practical, but why not? the advancement of science shouldn't be determined by profitability of a given project.
      • by PeteyG ( 203921 ) on Thursday August 21, 2003 @04:01PM (#6758866) Homepage Journal
        Because that 20 billion would come straight out of certain states' economies... so there's good reason for those congresscreatures to not be enthusiastic about it.

        That, and with all the stuff the military is doing nowadays (troll about whether or not that stuff is justified and you die), Congress is likely to only increase military spending so the military doesn't get spread too thin.

        *sigh* If only there were hostile space aliens...
        • Most of the companies that get paid to make spacecraft are the same ones that get paid to make military hardware - Boeing, Lockheed Martin, etc. There wouldn't be much of an economic hit - might even be a boost.
        • 20 billions less to the military house hold is (in construction costs) 4 carriers or 4 Stealth Bombers, yes they cost the same, a carrier is about the same price as a bomber.

          While both stimulate the economy, the local economy, they basicly both have no return on investment.

          Fighting a war and destroying the competition, removes the enemies economy, but has no long time effect(benefit) on your own as your economy does not need to do the necessary adjustments, as it can continue to run like it did so far.

          Ho
        • Unfortunately, if the hostile space aliens had the technology to get here... We'd probably be toast.

      • You are making the huge and generally unwise assumption that NASA will spend that money appropriately.
  • Typo (Score:5, Funny)

    by L. VeGas ( 580015 ) on Thursday August 21, 2003 @11:58AM (#6756042) Homepage Journal
    according to a leading lunar scientist

    That was supposed to be "loony" scientist.
  • Moon bases are dumb. (Score:5, Interesting)

    by n1ywb ( 555767 ) on Thursday August 21, 2003 @12:02PM (#6756088) Homepage Journal
    Why couldn't we have had humans living on the moon 20 years ago? Is there a technological reason? Afterall we could keep humans alive on the moon for a matter of days, all we'd have to do is launch frequent resupply missions and they'd be just dandy up there. Not really much different from the space station, except you get the added bonus of SOME gravity so maybe your bones won't complete decalicfy while you're up there. But there really are not pending technological obsticals to a moon base.

    Now, weather a moon base is practical, usefull, or economically feasable is a whole another ball of wax, and the answers are probably all "no". What the hell are you going to do up there? I would like to have a ham radio linear transponder up there, but other than that what is the moon really good for? It can't be a RELIABLE communications satellite because it's only in the sky half the time and is very far away with a very high latency. It's got some rocks and minerals but nothing that would be worth flying back down to earth. Scientific research I suppose, but what could you do on the moon that you can't do on the space station for a lot less money, due to it being so much closer? Yea yea, a jumping off point for a Mars mission. See above, what is really the point to going to Mars? We still don't have the propulsion technology to make frequent Mars trips a practical reality.

    One thing that could be a lucritive source of income for a moon base would be moon tourism. Perhaps the science could use it to fund itself, a la the russions and the space station.

    IMO, before we even think about a moon base, we need to think long and hard about what the fuck we're going to do with it. Send more probes, shit send a thousand probes. Don't send big dumb expensive probes, send little cheap insectiod probes. Do the same to Mars. If there's something interesting there, we'll find it that way.

    I know I know, if people said what I've said about the new world the US wouldn't be here. But the analagy with space is a little different. The "new world" was just another continent on earth. It had air, water, arible land, native people for which to enslave and abuse. Mars is a giant inhospitible desert with some frozen CO2 at the poles. Its possible we've overlooked something, but again it's a hell of a lot cheaper and easier to send probes.

    If someone wants to squander their personal fortune on manned missions to Mars/Moon, go for it, but I'd rather my tax dollars be spent more efficiently.
    • I totally disagree. First off, the moon could be set up as a base to launch more investigative, futher expeditions into our solar system. (prolly for cheaper, cuz it wouldn't cost as much to blast off from the moon, due to lower gravity) Second of all, perhaps there will be a different set of minerals up there that we could start mining and build stronger, yet lighter materials. Remember, we're only on earth here, and what we see is only a product of what our earth can perform. Imagine all those other
      • Uh, we can synthesize pretty much any chemicals we want. Plus we already have a pretty good idea of the Moon's geology, and I dont' think there's much there that could be turned into the futuristic superlight materials you dream of.
      • by Spamalamadingdong ( 323207 ) on Thursday August 21, 2003 @04:50PM (#6759342) Homepage Journal
        (that word in the subject means "study of the moon", in case you were wondering.)

        Quoth the poster:

        First off, the moon could be set up as a base to launch more investigative, futher expeditions into our solar system. (prolly for cheaper, cuz it wouldn't cost as much to blast off from the moon, due to lower gravity)
        Wrong. Getting to the moon is about as expensive as getting to Mars, more or less, largely because Mars has an atmosphere that you can use to brake against for free. Only a fool would go to the Moon, stop there, then launch off again to go to Mars; for one thing, you're much more efficient doing your boosting near the bottom of a gravity well rather than at the top of one (em vee squared, dude).
        Second of all, perhaps there will be a different set of minerals up there that we could start mining and build stronger, yet lighter materials.
        The Moon is largely made up out of minerals we are quite familiar with here on ol' Terra, and nature has done us a favor by differentiating them using water-based sorting processes which don't exist on Luna. You should do some studying of the subject; not only might you learn something, you might put yourself in a position to actually contribute something useful.
        • Wrong. Getting to the moon is about as expensive as getting to Mars, more or less, largely because Mars has an atmosphere that you can use to brake against for free. Only a fool would go to the Moon, stop there, then launch off again to go to Mars[.]

          Hm. True, but then you say...

          The Moon is largely made up out of minerals we are quite familiar with here on ol' Terra[.]

          Even more true! But then you miss the obvious - it shouldn't be that hard to flat out build spacecraft on the Moon (after all, they've g
    • by Atzanteol ( 99067 ) on Thursday August 21, 2003 @12:37PM (#6756463) Homepage
      I know I know, if people said what I've said about the new world the US wouldn't be here.
      But they *did* say it about the new world. All of the first voyages were coming the the new world looking for gold, passages to the east, etc. Only later was it for settling, and then it was out of religious persecution.

      So I agree that we need a 'reason' to go to the Moon. Once we've got that, it's only a matter of time.
      • by Anonymous Coward
        But they *did* say it about the new world. All of the first voyages were coming the the new world looking for gold, passages to the east, etc. Only later was it for settling, and then it was out of religious persecution.

        Does that mean GWB is going to drive Muslims to colonize the moon.

      • So basically the first "real" moon colony will be founded by ex-cons, people on the do-not-fly list and music sharerers fleeing RIAA?
      • I guess it was persecution, but not in the way you probably mean - the first settlers in what's now the USA were Seperatists, who wanted to be able to persecute everyone else...
    • by E1v!$ ( 267945 ) on Thursday August 21, 2003 @12:43PM (#6756512) Homepage
      On Earth 1 or 2 people die and we start inventing things to keep more from dying.

      The Sol system is a little less friendly. A comet or other planet wide disaster is more likely to kill a very large portion of the planet, and totally destroy it's manufacturing infrastructure.

      It would be far better to have a self sustaining economy away from Earth, one that could help rebuild our planet if BAD THINGS were to happen to it.

      Before we can have a s.s. economy in space, we need to take first steps. We need to put people up there and find out what they need based on the circumstances, then we invent it and move on to the next thing.

      The moon hopefully will provide enough resources for those living there to create what they feel they need.

      As to your tax dollars, c'mon man, wouldn't you say your grand children being able to take a shuttle trip or elevator ride to the moon would be a good thing?
      • Okay I'll agree with you whole heartedly that we need to distribute the human race to other celestial bodies to prevent the destruction of our species. Basic life instincts. We had/have technology to sustain life on the moon or mars, it's the getting back and forth that's really a bitch. Propulsion is THE limitation to more extensive space travel, but it's a technology which can be developed here on Earth. A Moon base won't help.
        • by WTFmonkey ( 652603 ) on Thursday August 21, 2003 @01:51PM (#6757152)
          What about launch bases on the moon? Escaping the moon's gravity to get to other locations has gotta be way cheaper than escaping earth's gravity. A network of these on the moon, maybe on one of mars's moons or mars iteself. I know, supplies need to come from somewhere, but shipping water from mars's icecaps to the moon might be cheaper than shipping water from earth to them moon. Yeah, I'm talking out my ass, but it sounds good to me.
          • What about launch bases on the moon? Escaping the moon's gravity to get to other locations has gotta be way cheaper than escaping earth's gravity.

            In order to get to the moon in the first place, you need to have almost completely escaped the Earth's gravity, so it doesn't help for launch of things that are originally from Earth. Best approach for that is to launch them to as _low_ an orbit as you can (so as to minimize delta-v required of high thrust, low-Isp drives), and to spiral the rest of the way out
            • In order to get to the moon in the first place, you need to have almost completely escaped the Earth's gravity, so it doesn't help for launch of things that are originally from Earth. Best approach for that is to launch them to as _low_ an orbit as you can (so as to minimize delta-v required of high thrust, low-Isp drives), and to spiral the rest of the way out over a period of months using a low thrust, high-Isp drive.

              Correct. But it does help for things that are going to Earth. That is, a base on the Mo
              • Correct. But it does help for things that are going to Earth. That is, a base on the Moon would be ideal as a place for docking spacecraft that shuttle back and forth between places (like mining the asteroids, for instance).

                Much as with lunar mining, this is only economical if you have a large amount of space traffic to and from Earth's region of space. No such traffic exists, nor will it exist in the near future. Even the arguments about towing metal-rich asteroids around only hold water if you assume th
                • Starting haphazardly.


                  The delta-v quoted by your source is far lower than the delta-v needed to get into a Hohmann transfer orbit even from free space in a circular solar orbit at Earth's radius (which the C3=0 orbit is the equivalent of). As the Hohmann orbits are the lowest energy transfer orbits that don't require slingshots from other bodies, I question the values on that figure.


                  Ah, there's your problem. The C3=0 orbit is NOT a circular orbit at Earth's radius. It's a parabolic orbit with Earth at i
            • It can actually be fairly cheap to launch from the moon, once you've covered the capital costs of setting up the launcher. You don't have to launch straight up; a tangent to the surface would do nicely. A very long solar-powered linear accelerator is practical on the lunar surface, because there's no air to provide drag. You might even be able to supercool / superconduct the electromagnets by tapping into the ground in a shadow zone. Not new, either -- read your Heinlein.
      • It would be far better to have a self sustaining economy away from Earth, one that could help rebuild our planet if BAD THINGS were to happen to it.

        Lol, planetary backup!

        I can just picture a meteor wiping out half the population of earth, and then some aliens come along and say "What's the big deal? Just restore your backups. You did have backups, didn't you?"
    • It's got some rocks and minerals but nothing that would be worth flying back down to earth.

      Maybe it has something that would be worth flying to the earth orbit? Say, water extracted from the polar craters. Later maybe some metals. But for that to work, we need very good power sources, very reliable mechanisms and technology that allows extraction of metals with limited supply of water and no heavy parts in the beginning.

      Considering that we have to service Hubble every 5 years because gyroscopes ke

      • Maybe I'm misreading your post, but why would we want to fly Lunar water to Terra, which is 70-plus percent covered with the stuff?
        • Water can be split it into hydrogen and oxygen and used as propellant. Also, I think the inhabitants of the space station(s) will prefer water from the Moon to the water extracted from their feces. It's easier to transport stuff from the Moon than from Earth, even to low orbits.
    • The moon is a great place to send criminals. Send 'em there for life as involuntary colonists. Let 'em dig big caves.

      As they dig those big caves they can grind the rock up for soil, melt pockets of ice that they find and use the water to grow wheat.

      You put the wheat in big metal capsuls and you use a magnetic catapult to chuck the wheat down the gravity well to good ol' earth.

      don't you read?

      • --For those not in the know, I believe he's talking about Heinlein's "The Moon is a harsh mistress":

        http://www.cyberhaven.com/books/sciencefiction/h ar shmoon.html

    • For one reason: He3.

      Read Enterning Space [amazon.com].

      1KG of He3 is worth $6 million.

      Transportation costs to space and manufacturing processes need to come together...oh yeah, and we need to figure out that whole fusion thing. But once we're there, science knows of no better energy source (outside of anti-matter).

      Good enough reason for me.
      • 1KG of He3 is worth $6 million. Transportation costs to space and manufacturing processes need to come together...oh yeah, and we need to figure out that whole fusion thing. But once we're there, science knows of no better energy source (outside of anti-matter).

        Why not just process He3 out of terrestrial helium? Sure, the ratio's about 1e-8 instead of the 1e-4 or so you have for deuterium, but you don't need a million tonnes of the stuff, and it stands a good chance of being cheaper to process it here tha
      • Supply/demand: if we find a lot of He3 somewhere, or a good way to make it out of common materials, it will not be worth $6 mil any more.
    • russions
      analagy

      *Russians
      *analogy

      Just had to switch the 'o' and the 'a'. ;-)

      Actually, the moon has been found to be a great source of Helium-3 [space.com], an isotope that would be used in fusion reactors if we had any.

      From the linked article:
      • "Helium 3 fusion energy may be the key to future space exploration and settlement," said Gerald Kulcinski, Director of the Fusion Technology Institute (FTI) at the University of Wisconsin at Madison.

      And:

      • Scientists estimate there are about 1 million tons of heliu

    • and very timely:

      Getting power from the moon. [physicscentral.com]

      More details at Space.com. [space.com]
    • On the small chance that this message is not a troll... I'll submit a few reasons why a moon base would NOT be dumb.

      You asked if a bas on the moon would be "practical, usefull, or economically feasable".

      "Practical"

      Let's see:
      - a nearly unlimited source of steel and other useful materials
      - no steep gravity well
      - lack of atmosphere means very efficient solar power collection, practically free energy
      - the moon is much closer than Mars
      Mean distance to moon: 384,000 km
      Mean Distance to Mars:

    • It's got some rocks and minerals but nothing that would be worth flying back down to earth.

      There is supposedly one substance found in quantity only on the moon that would be incredibly useful here on earth - Helium-3. He3 is not radioactive (and here's the good part) - neither are its fusion products. Imagine essentially radiation-free fusion power! See this list of resources [wisc.edu], specifically this article [wisc.edu].

    • I suspect the most useful part of a moon colony would be as the support infrastructure for orbital stations, factories and laboratories.

      The moon has the gravity we need as well a MUCH reduced cost of getting back and forth to orbit. Additionally the moon has the raw materials to support much of the construction of same.

      Shipping it all up from the bottom of earth's gravity well and through our atmosphere is going to be energy intinsive until such time as an orbital elevator(s) can and are built.

      I suspec
    • So WHAT?

      Do you need a financial reason for everything? Goodness, in this case feel free to sit on your ass and collect money thanks to some or other patent.

      Going to the moon would be fascinating. Who KNOWS what we would find up there? What we could do by creating a nice big moon base? Just the astronomy would be awesome.

      Heck, I'd sell myself into slavery for a two-month hotel vacation up there. Oh, wait, thanks to taxes I already am in slavery...
  • by hswerdfe ( 569925 ) <slashdot@org.howard@swerdfeger@com> on Thursday August 21, 2003 @12:04PM (#6756115) Homepage Journal
    "...acording to a leading Lunatic Scientist"

    somehow I don't think there is going to be a colony on the moon by 2023, I say we are lucky if we get a man back to the moon by then....
    sigh....
  • Slightly offtopic (Score:3, Interesting)

    by Randolpho ( 628485 ) on Thursday August 21, 2003 @12:12PM (#6756211) Homepage Journal
    The article mentions: "The craft will make an x-ray map of the moon" in regards to the probe being sent by tht ESA. How, praytell, are they going to do that? You have to have a receptor on the other side of the x-ray beam, don't you? I mean, it's not like *radar* is it? Not the last time I looked...

    So, what are they going to do, beam x-rays through the moon down to a receptor on earth or vice-versa? Somehow I doubt they'd get very accurate pictures.

    Are they going to have the craft drop a plate off on one side of the planet, zoom across to the other side and take the picture?
    • You're an idiot.
      They're not going to x-ray the moon like doctors do.
      They're gonna bounce the rays off its surface. You know, like you do with visible light? Its exactly the same kind of wave for christ's sake.
      • They're gonna bounce the rays off its surface. You know, like you do with visible light? Its exactly the same kind of wave for christ's sake.

        All EM waves are not equal.

        Low-frequency waves, like RF and up through the microwave range, interact with matter like classical EM fields. They're reflected by conductors, and mostly absorbed by dielectrics.

        High-frequency waves, like light (IR through UV), are in about the right energy band to interact directly with electrons in atoms. This process involves both cl
        • Backscatter can be used for imagery, in many cases for imagery that transmission X-rays are unsuitable for.

          Recall a few months ago a /. article on backscatter X-ray imagery being used to detect weapons at airports/contraband at border checkpoints that transmission X-ray scans would miss.
    • Re:Slightly offtopic (Score:4, Informative)

      by LittleBigLui ( 304739 ) on Thursday August 21, 2003 @12:38PM (#6756475) Homepage Journal
      Think about it. You correctly identified rays as going THROUGH the subject, to a hypothetic receptor on the other side. Obviously, for an image to manifest, the amount of energy that moves through the subject has to vary, otherwise the image would be all-white (or all-gray). Hence, we have some of the rays moving straight through, and the rest of the rays being scattered away. Some of those will be going straight back to where they originated from. Hence, you get just the same image (well, inversed) if you place the receptor right at the source.
  • 15 month trip ? (Score:3, Interesting)

    by jalet ( 36114 ) <alet@librelogiciel.com> on Thursday August 21, 2003 @12:18PM (#6756273) Homepage
    Is the "15 months" trip due to the ionic propulsion method ?

    I believed that "traditionnal" engines could send people on the moon in two days.

    Anyone can explain ?
    • Weight of ion engine: a few pounds.

      Weight of 'traditional' engines (which actually, we can't rebuild- we would have to totall re-engineer from scratch) which took us to the moon: thousands and thousands of pounds.

      Both will get you there. Which do you choose, as a rocket scientist?
      • I meant that ionic propulsion is not a solution to send people there if the ones who got there 30 years ago had a three days trip...

        But I'm not a rocket scientist
        • I meant that ionic propulsion is not a solution to send people there if the ones who got there 30 years ago had a three days trip...

          It may very well be cheaper. Lifting something to low earth orbit is hard. Lifting it to escape velocity (or nearly so, for a lunar transfer orbit) is even harder.

          You shave at least 4 km/sec off of your required delta-v if you can use ion drives and have a longer trip.

          You're going to keep these astronauts on the moon for years anyways; why not spend the first year or so en
          • Thanks to all for the explanations !
          • Nope (Score:3, Insightful)

            You shave at least 4 km/sec off of your required delta-v if you can use ion drives and have a longer trip.
            The delta-V is a function of the path; the required delta-V for a typical ion-drive trajectory is actually a bit higher than a two-impulse elliptical transfer. What's reduced by ion drives is mass ratio, which you would expect from the rocket equation. [mit.edu]
            • The delta-V is a function of the path; the required delta-V for a typical ion-drive trajectory is actually a bit higher than a two-impulse elliptical transfer.

              Let me clarify - you shave 4 km/sec off the delta-v you need to produce using chemical rockets.

              An ion drive with an Isp of thousands or better can use even an inefficient transfer scheme and use only a little fuel. Adding 4 km/sec using a rocket with an Isp of 300 gives you another factor of 3+ on the fuel:cargo ratio.
              • Let me clarify - you shave 4 km/sec off the delta-v you need to produce using chemical rockets.

                It was clearly wrong (either erroneous or grossly mis-stated) the first time.

                Getting to LEO from the ground requires roughly 5 miles/second of delta-V, about 8 km/sec. Getting to escape velocity requires about 7 miles/second, or 11.2 km/sec. If you chop 4 km/sec off the delta-V for escape, you're down to 7.2 km/sec and you will not even achieve orbit.

                You're right about the mass-ratio, so I suspect that you're

  • by dpbsmith ( 263124 ) on Thursday August 21, 2003 @12:24PM (#6756332) Homepage
    The article just says it's technologically feasible. How boring.

    In the movie The Right Stuff, and, IIRC in the book,a congressman says to an astronaut "What makes your rockets go up?" The astronaut starts to saying something about reaction masses and exhaust velocity, and the comgressman cuts him short and says, "No. What makes your rockets go up is funding."

    Of course a Moon base is technologically feasible. Goodness, if we're just talking technological feasibility we should be able to be a lot more imaginative than that. (Project Orion [islandone.org], anyone?).

    But unless someone "salts" the Moon with gold nuggets (I believe it's in Carl Sandburg's The People, Yes in which someone starts a rumor that there's gold on the Moon, and so many people start heading for the Moon that the person who started the rumor figures there must be something in it after all and joins them) I don't see how it's going to happen.

    (Another nugget from The People, Yes "Another baby in Cuyahuga County, Ohio--why did she ask: 'Papa, what is the moon supposed to advertise?'" I'd give a nickel to know whether Heinlein read that before writing "The Man who Sold the Moon.")
    • He3 for fusion is worth probably as much as gold, if not more .

      Several other posters on here have mentioned it .

      The dark side of the moon would make a great place for
      a Telescope roughly 3 or 4 times the size of the
      Keck telescope in Hawaii .

      The solar power on the moon would be very plentiful, and
      we could build the majority of this with robots and remote
      control systems .

      Yes, there is a 2 second dealy, but we have a further dealy to
      mars and use the rovers there in a similar manner .

      Build the moonbase unde
  • "As reported by the BBC, humans could be living on the Moon within 20 years, according to a leading lunatic scientist."
  • Wait until I tell Alice!!
  • A rat done bit my sister Nell with Whitey on the moon.
    Her face and arms began to swell and Whitey's on the moon.
    I can't pay no doctor bills but Whitey's on the moon.
    Ten years from now I'll be payin' still while Whitey's on the moon.

    The man just upped my rent last night cuz Whitey's on the moon.
    No hot water, no toilets, no lights but Whitey's on the moon.
    I wonder why he's uppin me. Cuz Whitey's on the moon?
    I was already givin' him fifty a week but now Whitey's on the moon.

    Taxes takin' my whole damn check,
    T
  • We should have been on the moon 20 years ago. Right now, we should be focusing on colonizing and mining the asteroid belt. I for one am glad other countries are bragging about what they're going to accomplish. maybe that'll finally get the US off its butt.
    • One Asteroid 500 miles long is nearly solid nickel .

      I think it would be alot easier to have robots land on it,
      mine it, and rail gun it to the moon .

      Then use it to build space craft or whatever on the moon .

      If the earth is wiped out due to disease, nuclear war,
      or some other human engineered disaster, we need a backup
      plan , and the moon is the closest one to us .

      A moonbase is a good idea, all the He3 up there is a good idea .

      We can use the MUCH stronger solar power up there to make it work .

      We have robo
  • ...that I saw several gammaspans ago (a moon unit of time, roughly equivalent to your Earth-year):

    Amazon Women on the Moon [imdb.com]!

    "This is just a hunch, but..."
    "Steve! What are you doin'?! You're committin' suicide!"
    "Ahhhhh. Seems the moon has an atmospere similar to Earth's."
    "Good 'ole H2O!"
  • Actually, this guy named Dennis Hope claims to own the moon. Pack your bags, NASA, he's not selling. http://www.webee.co.jp/southpaw/cx/htm/wwwboard/me ssages/170.html
  • If everything goes according to plan, I'll be around 55 when all this happens. Will I be too old to visit the moon, just to say I was there? Will I have to shell out 20,000,000 just to visit like Lance Bass? I hope not.
    I hope to one day visit the moon, and maybe Mars, but I fear the $$ will keep me here, on the good olde Earth.
  • The writers and producers of the science-fiction classic, "Space 1999 [space1999.net]", were off the mark by about 25 years. "Space 1999" was broadcast by NBC in 1975 and dealt with the lives of colonists on a moonbase called "Alpha". The series began with an episode where a nuclear explosion hurls the moon out of the earth's orbit. Each succeeding episode of the series descibes the dangers that the colonists face in space.
  • Let's just hope they never have to say, "We're sitting on the biggest bomb man's ever made."

    (Yes, I'm seriously dating myself. No, not in that way.)
  • Seriously though, there would be huge benefits if we could arrange a permanent outpost on the moon. It's certainly possible to do so within 20 years, hell the US sent a man to the moon after ten year research. The problem? Designing and building any form of outpost would require international cooperation. The ISS is a good example of what's possible and what can go wrong.

    Sure we can stick a few people into the ISS for 6 months, but the moon is another matter. It's unprotected by Earth's magnetic field, so
    • Here is one of my previous articles as to why I think it
      is possible, just have robots build it , not humans .

      http://slashdot.org/comments.pl?sid=75577&cid=67 74 437

      Also, build it underground, you need to mine it anyways
      for raw matrials, and we built a tunnel under the
      english channel .

      With much less gravity it is much more feasible .

      Peace,
      Ex-MislTech

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