You are not logged in.
Instead of worrying about how to make things smaller, how about making things much, much lighter? The following questions come to mind (feel free to add more):
1) How light in construction can you go, by using a virtually all-inflatable "Planetary Transfer Vehicle"?
2) How strong a magnetic field do you have to have around the craft to give it the same protection that solid, heavy shielding would give? Is the power requirement low enough to be met with solar panels?
3) Instead of using an ERV going directly from Mars to Earth, why not send the Mars surface hab seperately, and use the same (large) vehicle for both trips? This requires three launches, but still...
4) Because mass is expensive, but people need companionship for psycological reasons, why not send two crewmembers and *two lightweight pets*? People bond with pet animals as well, and they will use much less room, food, and water.
5) Mars Direct had lots of rovers and such. For a first "quick-and-dirty" mission, how about just sending one unpressurized rover to save a lot of weight? If it has a sortie range of 50km, that's still nearly 8000 square kilometers that it will cover.
...While lithium is used in anti depression drugs, good news for them moody fishies!
Maybe we could make those lithium tanks burn up over the Middle East. There's a lot of people who seem to need a bit of lithium in that area.
Had the same problem with many parts of KSR's mars trilogy. I would get to certain chapters, roll my eyes when it was a particular characters "turn" and try to fly through those passages as quickly as possible.
I have this problem with KSR in general; IMHO, the Mars Trilogy is much less annoying in this regard than "The Years of Rice and Salt", which inspired that sort of reaction in record amounts. Another writer who inspires that reaction in me is Robert Sawyer.
The basic problem isn't really that they're bad writers; far from it, they both write beautifully and tend to develop interesting and well-thought out plots. The problem that both of them have (having not read anything by Anne Rice, I'm uncertain if she falls into the same trap) is that they like to incorporate pet ideas into their stories which are either uninteresting to the reader or which, if completely stated out, are objectively silly, and vigourously push these plot elements. The result is that my suspension of disbelief, essential for enjoying a novel, gets shaken up from time to time. I'll provide a few examples:
"The Years of Rice And Salt" is the KSR book I most recently read and is the most egregious offender in this regard. The biggest and most serious flaw, IMHO, is that KSR wipes out an entire chunk of the world (Europe) prior to the Renaissance, and yet technological progress somehow is not adversely affected by this. This flies in the face of all logic; if the area which (from the Renaissance on) is the main mover in terms of innovation and change is suddenly eliminated, you would expect to see... less innovation and change. Certainly not none, and I'd figure that the ball would have started rolling somewhere else sooner or later, but it's not unreasonable to expect that progress would be retarded about 100 years or so. "The Years of Rice and Salt" also featured KSR's love of Sufi mysticism, an annoyance in both this and "Red Mars" which severely destracted from both the alt-history of "Rice and Salt" and the SF "Red Mars".
On the other hand, Robert Sawyer seems less enamored of certain ideas than blinded by them. His Neanderthal stories depict a totally unbelievable civilization, and in general there is such a strong PC streak underlying the assumptions of his book that surely I can willingly suspend disbelief at how easy it is to travel to a parallel dimension because R. Sawyer obviously comes from one.
The king of all offenders in this category, however, is actually Arthur C. Clarke himself, who in a few of his books is *so* outrageously, illogically, and irrelevantly antireligious that it's like being mortally insulted throughout the whole story. "3001" was so hideously bad in this respect that I've basically sworn off his books entirely.
Considering that reliable ignition is always a concern with non-hypergolic fuels, I was just wondering: why don't they include two small tanks of hypergolics to light up a 'pilot light', instead of using electric ignition? Especially for anything left in space for a while, it seems much more reliable to me; rather than mess around with stuff that has been exposed to space and you aren't sure about, use a shuttle RCS engine to give the main engine a light.
You are going to have to either include alot of fuel in the stage or reach much higher then LEO in order to even enter an eliptical orbit. There is no trick or magic with an eliptical orbit, it isn't special.
I know that the upper stage will require a nontrivial amount of fuel. The idea is to replace the first stage of the rocket, not the entire rocket or everything but a tiny corrective bus-like stage. It's more like a very long cannon that accelerates a rocket at non-lethal-to-humans speeds. The air evacuation part is merely to reduce air resistance, and it might not be worth it in terms of energy saved, to be honest.
Evacuated balloon tunnel into LEO... well, its one of the more original technical ideas I've heard around here.
The problem with it is that when you get to LEO, you wouldn't have any horizontal velocity, and thats the killer, you need to be going Mach 25 to reach a stable orbit.
Yes, I know that. However, what is actually necessary to achieve orbit is to throw the spacecraft at the earth and miss, so to speak. What I was envisioning is to use the railgun system in place of the first stage of a TSTO system; the accelerated mass would be a pod consisting of payload and an upper stage which provides enough sideways momentum to push the craft into an elliptical orbit about the earth.
The Soviets deployed space weapons not-so-secretly in response to paranoid fantasies of US space weapons real and imagined for a long, long time, so this is no surprise. They armed a few of their Salyut space stations, after all, in case the US armed an Apollo with machine guns and flew up to shoot it down. Not kidding.
The main problem is that the sheer weight of the liquid in the pipeline is going to be huge. That's one long garden hose, Errorist.
I've just thought of a different, equally crazy idea for getting stuff into orbit cheaply. Instead of building an incredibly long tether, build a ring of inflatable balloon pillars instead, reinforced with aluminum rings every so often, to a height of 150 miles or so. Pressurize the balloons with helium and reinforce them with Kevlar or something and wrap the structure with plastics to make the whole structure airtight. You could evacuate the air from inside the tube, since it's sticking out into LEO, and run a linear magnetic accelerator up the center to accelerate payloads.
No point to it, Errorist. First off, that property applies to water, which has a variety of odd properties for a liquid of its molecular weight. Second, it wouldn't work to orbital heights.
The biggest problem with the 'pipeline to heaven' is the mass of the liquid in the system, which would quickly prove to be prohibitive. It's far simpler to build a normal elevator with a tanker car of sorts.
BWhite -
Actually, I think that Bush and Putin do work together informally. There have been scattered glipses that the US and Russia exchange intelligence on terrorism, etc, and otherwise work together without explicitly working together. I believe no formal alliance or agreements have been made precisely because the threat is very diffuse and decentralized. The only real glitch in the relationship is over Iran's reactors (and I think that Russia is acting out of honest cynicism - they know that neither we nor Israel will tolerate the existence of those reactors and facilities, and have decided to make a fast buck out of the mullahs before said mullahs are dead).
With France, it's primarily the huge clash of personalities between Bush and Chirac; they detest each other immensely, and unless some hideous catastrophe forces them to work together, they're not going to work together. If France has a new President, then US-French relations will probably improve... honestly, they haven't been worse since the 1860's, so it's a good guess.
The only long term solution is to find a common "human" identity that supercedes lesser divisions.
An alien invasion fleet spotted on radar about 40 years away from Earth would be quite helpful, right about now.
The ultimate wag-the-dog scenario. If the US, Russia, China, and EU collaborated on it, there's really not much other people can do about it, and it gives you the best possible excuse to slap around the usual suspects for starting wars (ever notice that, apart from WWII, all the modern wars are set in motion by some pissant little country that has no particular world power? (1)) into some semblance of peace. Let's put Cobra on this idea.
(1) Whether you agree with the war or not, the late Iraq War is definitely thought of as being part of the greater War on Terror in the US, so that war is not a counterexample. The only example of a major power starting up a major war in the past hundred years is World War II.
Go ahead and build the light space elevator on the moon. How often are you going to send stuff from the surface anyways? Send everything up in 200 kg packets and build a light 'warehouse' space station at the correct stationary orbit height.
Strange idea: why make a ribbon at all for Earth? Why not build a nice long maglev line on a mountainside for accelerating scramjets? The military can use it to fling bombs when it's not being used for civilian pursuits, and it's a lot more near term than the elevator. Plus, you don't need to locate it near the equator.
I don't think anyone has yet designed a bladder material that remains flexible at cryogenic temperatures.
-- RobS
Then use either use storable non-cyrogenic fuels or try something else - long coiled tanks that an aerogel ball can be pushed through like a piston by compressed gas, a rigid umbrella-like device that can open up inside the tank and pull down to force the fuel/oxidizer out, building a tank that has an insulative blanketlike thing around the gas bladder so IT can expand (regardless of whether or not the cyrogenic liquid can be stored in a flexible bag, the gas is storeable)...
Two serious methods of transferring fuel occur to me: One is to design the engine/pump assembly/etc to be seperate from the actual fuel/oxidizer, which should be designed as a modular unit that can be plugged into the engine assembly with a minimum of fuss, but this is probably too complicated; the other, probably more doable method, borrows from the method the Army uses to refuel tanks in a hurry.
The US Army has this entertaining method of fueling a tank in a hurry whereby they use a large flexible bladder-like device full of fuel, attach a hose to the fuel tanks, and then run over the bladder, forcing fuel into the tanks without any complicated equipment (other than the tank itself, of course). I was thinking that designing a fuel transfer vehicle so that it has the bladder inside a fuel tank, and another bladder, empty at takeoff, which can be filled in orbit with some inert gas like helium or nitrogen. The expanding second bladder would crush the fuel or oxidizer bladder and force fuel through the refueling attachment into the other craft. This would seem to solve a lot of problems with the 'no gravity' situation of transferring fuel in orbit. The same system could be used to transfer bulk water, too.
The EU does believe it to be 'the wave of the future'; however, Europe is so economically/demographically screwed that i can only call this a hallucination. From my perspective, it is not Washington but Brussels that is the center of the surreal, generating phone-book sized constitutions, having thousands of elderly people die in national heat waves, having the vapors over genetically modified foods, and seeming to take joy in reflexively opposing the US on any given issue.
I have other thoughts on the issue, but I've basically decided that the best course is to simply let Europe twist in the wind until it wants to get serious again. As far as I'm concerned, NATO is almost dead, certainly on ice, and shared cultural roots be damned.
The controversial case seems to be if your neighbor's farm uses Round-Up resistant grain seeds and some blow onto your land and cross fertilize your seed. Likewise, if you plant a patented seed and later try to switch away, the farmer needs to make sure NONE of the patented seeds grow in subsequent years.
It seems a problem in with regards to self-replicating 'intellectual property'. Some sort of laws need to be drafted to clear that up, and pronto, or there will be serious lawsuit shit when human germline engineering (coming sooner than you expect) comes around.
Cool. Makes me almost want to sign up for the air force. Of course only the very elite will get to fly these things.
Odds are still better than the astronaut corps.
I completely agree with Cobra on this one. If Boeing builds a scramjet space bomber, they'll be building a scramjet SSTO almost immediately thereafter. The military will even be doing us the favor of training the pilots for the things, developing the techniques and protocols necessary for frequent space travel, and assuring insurers of the relative risks of each particular flight.
Anyways, look on the bright side... right now you need to navigate NASA's lengthy process for becoming an astronaut, which only the most miniscule number of people will pass. However, if the Air Force is recruiting people to fly orbital/suborbital bombers, your chances are much, much higher... and you're likely to fly a lot more than those astronauts.
FL definitely to Bush. Kerry is getting crushed like a cheap tin can. So much for exit polls; of course, they called the governor's race 2 years ago "a virtual dead heat" and Jeb Bush won by similar numbers.
Predicting a Bush win, 50-49 in popular and winning about 280 EV's or thereabouts.
http://www.wired.com/news/medtech/0,128 … tml]Bionic Rat-brain computers fly planes.
No further comment necessary. However, the next generation of rover control 'hardware' has probably been found. This sort of computer could autonomously guide a rover around, I bet.
Hermetically seal fresh food, irradiate it (thus killing the pesky microbes causing spoilage in the first place), then stow it on the ship. You don't HAVE to freeze the food, to keep it from spoiling. :;):
Requesting reinforcements... an army of straw men is advancing on my position.
I'm saying that, on Mars, in the context of a colony that has no or few resources to spare, the option to incarcerate an individual for long periods of time is not available. The option to invest a lot of time and money into ensuring that the innocent are not executed is also not available. Thus people will be executed, and if there is any sort of sizeable violent crime rate, there will be innocent people executed. If you cannot deal with this, don't go to Mars. At least, don't go until the colony is larger and can support those sorts of things. No amount of airy argument is going to budge this reality.
As for an earlier comment of yours:
Punishment is irrelevant?
No, deterrence is irrelevant for violent crimes under the conditions of an early Mars colony. As you pointed out, criminals are motivated by fear of capture, not fear of punishment. However, a criminal that is dead (or permanently behind bars, although that isn't a realistic option for Mars at first) isn't able to commit the same crime again. Most people who speed are 'serial speeders', so to speak, most people who rob banks are likely to do it again.
I also don't advocate the death penalty on Mars for minor offenses; there are likely to be any number of unpleasant crap jobs around the dome that can be doled out to people who have engaged in petty nonsense (small time theft, fistfights, etc). In the case of murder, rape, etc, however....
Why, I do believe Morris that you have articulated a price upon life!
Quote
it is perfectly reasonable that capital punishment be used in cases of violation of laws against religious preference when deportation is not an option (i.e. there is no money for return passage).Your base claim assumes that capital punishment would act as a deterent against such crimes. I wonder what the literature says about the effectiveness of such punishment on the criminal element in their determining to commit a crime? Of course I know, and I think you know, so I'm a bit surprised you end up here at your logical conclusion.
Perhas I am mistaken, but isn't the failure of the capital punishment based as a detterent based on the fact that the criminal choice to commit crime does not evaluate the associated punishment with breaking a law, but merely the chances of succeeding in breaking the law without consquence? Those with the mind to break a law don't worry about the punishment, they worry about getting caught.
Need proof? When you speed in your car, or you jay walk across the street, do you think of the punishment for your crime? Or do you look to see if there is an officer to enforce the law and catch you?
Capital punishment is nothing more than satisfying the blood lust of the social group and to empower the State as the ultimate power above individual. You speak elequotently about the rights of Man, inherent and all that, yet somehow hold the contrary view that the inherent rights might be violated by the group construct.
In a matter of self defense, of course, we have as much right to use as much force as neccessary to protect ourselves. But a man in chains poses no such threat.
And as for Singapore, would you subject your children to a city that used such laws? If it works for them, more power to them, but I think it's rather needless all the same.
Actually, I agree with Morris's point, but out of sheer expediency: on Mars, someone who has been convicted of a serious crime should just "be shown the door", so to speak. The deterrent effect is irrelevant; corpses don't commit crimes or soak up scare resources while penned up in a jail cell. As for Singapore, I personally don't mind their legal system except for the nitpicketyness of their laws.
I read a story of why the Islamic terrorists did not target the Russians in the Communist era, when Jimmy Carter was involved with Iran. The story goes that the Islamists kidnapped a Russian, and the Russians kidnapped a relative of a terrorist, sending back one of the family jewels. No more kidnapping dangers for the Russians.
Actually, if I recall correctly, this is not quite an accurate summary of events. The terrorists had kidnapped the man and were threatening all sorts of nasty things to him. The KGB abducted two members of the group, shot them full of bullets, stapled a note to one's forehead saying "Two a day until we get ours back" and dumped them on the doorstop of a sympathizer. Various terrorists started turning up in Beirut dumpsters over the next few days.
The Russian was released.
That terrorist group never bothered the Russians again.