NASA's Own X Prize? 152
Roger_Explosion writes "NASA has announced that its 2005 budget includes 20 million dollars allocated to what it calls 'Centennial Challenges.' These are described as 'a series of annual prizes for revolutionary, breakthrough accomplishments that advance exploration of the solar system and beyond and other NASA goals.' The article on the X Prize site seems to suggest that this was a collaborative effort between the X-Prize organisation and NASA. You can read the story on the X Prize site."
Tourism? (Score:5, Insightful)
I see in my mind's eye several hawaiian shirt and sunglasses wearing citizens doing limbo and playing shuffle board on a double decker space bus. It just feels tacky and it is far removed from my utopian Star Trek TNG tendencies of space exploration.
Is humankind so pathetic that the only reason we want to go into space is to expand the tourism industry?
Re:Tourism? (Score:3, Interesting)
Besides, tobacco farming and the fountain of youth have already been used as excuses to leave home...
Ends justify the means? (Score:5, Interesting)
Re:Tourism? (Score:5, Insightful)
Re:Tourism? (Score:5, Interesting)
Since when did we become such spineless weenies!!! I can't even believe the silly crap wafting to my ears... we just spent enough money to freakin' move New York city to the moon, bombing the crap out of people who weren't bothering anybody but each other, all so that President Shrub could give his Daddy the most expensive Christmas gift in recorded history. Then we decide we haven't got the intestinal fortitude to pursue our destiny, our inspired future, because we haven't the will to generate the amount of money collected by The Starbucks Corporation during any given 45 minutes period of their business day. Oohhhhh, it's soooooo hard to save the kind of money needed to get into space, it's so expensive. Oohhh, let's suck up to the "spa class", and suggest maybe the best tan in the universe can be had on the moon! Then they'll build the future for us and we won't have to grow a friggin spine!
People... Suck it the FSCK up... our future is out there. It's not here. Here will go away. Here is dangerous... we got asteroids, and super volcanoes, and tsunamis big as mountains, we got global warming, we got methane in the sea floor, we got virii and ice ages, and it's just a very uncertain place to be... we need to spread our eggs to more than one backet. We need to get life to other places. We need to explore and grow into our universe. All of that takes guts. All of that takes commitment. It takes saying I will pay the price of admission to build a bold future, that mankind will have more than we have today.
I'm willing to contribute the price of a Grande Mocha Latte with a shot of hazzlenut, if I know that in ten years we'll have a sustainable access to the universe, and that in twenty years a half million people will live on the moon.
This is one of those time when somebody with a little vision and a lot of testoserone needs to stand up and say follow me, I'm going up there, last one there to join me is a BIG FAT WEENIE!!!
Genda Bendte
"The meek shall inherit the earth the rest of us shall receive the stars..." -- Isaac Asimov
Why was this modded down? (Score:1)
If you don't agree with what they are saying why don't you come up with some intelligent counter-arguements? There are some trolls who need to be modded down and ignored, but I don't think this is one of them.
Re:Tourism? (Score:2)
Why did Columbus sail? To open a commercial route across the Atlantic to buy luxury goods for the rich from the East
How was the technology Columbus used developed? By the patronage of Henry the Navigator, whose goal was to forge a Portuguese route to the East for the shipment of luxury goods for the rich from the East Indies.
It's very nice to rant about how space is a matter of long-term survival. What's going to get us there is the same thing that got Columbus to America -- the chance to make
Re:Tourism? (Score:1, Interesting)
Hopefully this doesn't spur on further developements such as the planned russian tourist space station [chron.com]...
Not that I wouldn't personally love to have a chance to travel in space myself, but NASA should be more concerned with keeping its astronauts and shuttles in shape.
Re:Tourism? (Score:5, Insightful)
I read that the top 500 millionaires said they would pay up to $100,000 for a short flight into "subspace". By offing space tourism as a new luxury for the wealthiest people in America, these people are more likely to consider investments/donations for more exploratory space programs (namely NASA).
Re:Tourism? (Score:4, Insightful)
Re:Tourism? (Score:2, Insightful)
Agricultural areas would be needed to reduce expensive f
Re: (Score:1)
Re:Tourism? (Score:3, Insightful)
And the unfortunate truth is that in today's society, unless there's money in it, there will be no space industry. The powers-that-be are only interested in increasing th
Re:Tourism? (Score:5, Insightful)
No, there is NASA and others that do it, they have many dedicated staff that would make much more money in industry.
Also how much have you donated to space travel? Why should a company (not govt) invest millions of dollars for the heck of it? Same reason you do not give up large portions of your salarly willingly for a myriad of other cause. There is nothing pathetic about it.
It's not preciesly greed, it's putting the carrot out for the donkey.
I am willing, and have, given parts of my salary for causes I greatly believe in (though not space travel - I probalby would if I saw someplace and thought about when I had some extra money). But my paltry contributions would get no-one nowhere in space, nor would what the vast majority of individual companies could give would be a dent in it. But if there was said carrot they are willing to gamble.
And lastly, should they actually flat out give the millions upon millions and time I bet there would be a great deal of people (not saying you, I don't know you and have no idea) that would lambast them for not giving to some charity or other org.
In short, without said payoff there is dis-incentive for a business to go to space. That is why the govt taxes us and spends on the grand human/technology driving projects that have no real hope of turning a profit (while there have been individual compnents that have made a fortune it is small compared to the overall cost of space exploration - not to mention had they actually patened the stuff it probably would not have spread as far as it did rendering smaller sales on top of that).
"It just feels tacky and it is far removed from my utopian Star Trek TNG tendencies of space exploration."
Remeber two things. By the time of star trek much of the scarcity issues that drive our economy were gone (especially by TNG) allowing pretty much everyone to persue thier humanitarian ends. I would imagine if we ever achieve all the food/energy/environment/toys we could want then Star Trek philanthropy will be a reality. Even then you had other types of greed/carrot. And secondly the Ferengi
Re:Tourism? (Score:1)
Re:Tourism? (Score:1)
YES, we are! Just open your eyes and look around.
Re:Tourism? (Score:5, Insightful)
The problem is that you cannot just leap from a planet-bound existence to a space-based one. The expense of reaching orbit or escaping gravity entirely is slowly coming down, and at each stage it's essential to approach the problem of reducing costs still further in different ways. At one stage, only governments can afford to put things into space. Then, corporations. We're there now - you can pay for satellite launches. Who's going to pay for the next stage? Probably the people who can throw money at something just because they want it - namely, the rich. And what do wealthy people want from space, at this point? Gratification.
You'll get your moon colonies once those space-tourists start cutting down the cost per pound of space launches.
Re:Tourism? (Score:2)
If only it were so. Forget the 'blank sheet of paper' utopia that you picture. I'm rich, I decide to move to the moon, I buy several acres of moon and build a big house in the middle of it surrounded by sculpted moon rock in the style of some random japanese designer.
I need a few staff, someone to wash my car, and people to cook my food when I go into town for a meal. Somehow I doubt that these people will also have a couple of acres of moon to live on
Re:Tourism? (Score:5, Insightful)
I also strongly disagree with your opinion of tourism. If we manage to make space travel so reliable, affordable, and safe that people are doing it just for kicks...! Imagine a world like that! It doesn't mean we're going to stop having scientific missions. But it means that I can hop on a shuttle and go visit the moon, or another planet, or maybe even see another star. Not because I have any great reason, just because I want to. The freedom to go anywhere in the solar system for only a couple thousand bucks? Wow. I certainly think that's a noble goal, even if you don't.
Re:Tourism? (Score:2)
What do you suppose is the financing source of all the impressive space infrastructure you see in Start Trek TNG? Taxes?
Re:Tourism? (Score:2)
The Federation has such total control over its citizenry and their property that taxation is no longer neccesary. Since nobody outside of starfleet appears to have a significant amount of wealth and they don't pay their employees anything, what's the point of taxation?
Call it Space Adventure Travel (Score:1)
I see in my mind's eye several hawaiian shirt and sunglasses wearing citizens ... Is humankind so pathetic that the only reason we want to go into space is to expand the tourism industry?
Thanks for your application to the Celestial Fashion Police. Indeed, the Galaxy needs hand-picked uniformed police like you to turn away millions of ugly space tourists at the airlock.
We've heard reports that some of these unsightly revelers have been sneaking aboard shuttles under false credentials as space adventure
The answer to your question: (Score:2)
Yes.
Migration! (Score:1)
The quest for profit drove terrestrial exploration (Score:2)
Re:Tourism? (Score:2)
NASA (Score:3, Insightful)
Re:NASA (Score:3, Funny)
Finally (Score:4, Insightful)
Re:Finally (Score:3, Insightful)
Funny how you think the private sector should get more taxpayer money...
Re:Finally (Score:5, Insightful)
Re:Finally (Score:2)
The total money invested by X-Prize contestants far exceeds the $10 million prize. The prize system can act as a very effective amplifier for taxpayer money!
Re:Finally (Score:1)
They should if it's a solid investment.
Let's see... give away $20 million to a company that might sell $20 billion in space travel. What 35% (or more) of $20 billion again? More than $20 million, right?
Re:Finally (Score:4, Insightful)
So, the government should give them free money collected from taxes, and then let them rake in the profits privatly afterwards? Screw that, if the private sector is so great, it can generate its own revenue (real world example: from selling toys).
Re:Finally (Score:1)
Re:Finally (Score:2)
Secondly, I'll pick the easiest of your fallacies to debunk:
Space travel currently has no economic return.
One word: Telecommunication.
Never heard of satelittes have we?
Re:Finally (Score:2)
Re:Finally (Score:1)
Looking towards the future... will stuff like Gattaca [imdb.com](a personal favorite)--descrimination based on physical ability or percieved physical ablitiy-- enter everyday lives? I know the BoyScouts/Army are running Don't Ask/Don't Tell policies. As of now space requires certain physical abilities and fortitude. Can there be selective/non-descrimination based choices for who can do what? With the growing population
Re:Finally (Score:1)
Then we'd be talking a Beowulf of in Soviet Russia all your base belong to us.
Hats off to the letter-writers (Score:1)
Here's to the pilots in the Mojave Desert, the Israelis, Romanians, Italians, and Canadians for stepping up.
Re:Finally (Score:3, Funny)
The Boeing/Microsoft SpaceCruiser XP is not even in development yet (cue someone posting a link to "if airlines were like operating systems").
So remember, big corporations are EVIL!!!, but small businesses are OK. Here's another example in the IT industry, to illustrate my point.
Dell:
Makes bad computers full of preloaded bad software, advertised by bad commercials. Known to operate
Re:Finally (Score:4, Funny)
Lemme guess -- Boeing makes the mechanism for going up, and Microsoft makes the mechanism for going down...
Re:Finally (Score:2)
Do you mean this link? [zyra.org.uk]
I'm sorry...I couldn't resist. :)
Nah Thankie U (Score:3, Funny)
$20M??? (Score:4, Interesting)
Re:$20M??? (Score:4, Insightful)
The $20M is just icing.
Re:$20M??? (Score:4, Insightful)
Keep the proper scale in mind (Score:5, Interesting)
For that goal (especially the "cheaply" part), increasing the amount of prize money could actually be detrimental. An expensive winning vehicle in 2000 (which could have been done, if the prize money was enough to lure a big aerospace company into the race) would have been much less of a "return on investment" than a cheap winning vehicle in 2005.
A big part of the reason why space exploration is stuck in a rut is that when we started it, we had a post-war technology (expendible artillery rockets) that could be used to "get people to space, and damn the cost". Well, we've been using those sorts of rockets ever since, and "DAMN, the COST!" Rocket fuel is cheap, but rockets and rocket engineers are expensive, and when we throw away the former and hire armies of the latter to supervise a few launches a year it gets really expensive. There are a lot of people (myself included) who think that the only way to change this is with reusable, rapid turnaround launch vehicles, and who speculate that the natural way to develop those vehicles is from technology developed flying suborbital prototypes. Our previous strategy of "start with a huge orbital rocket, and try to make it cost effective" (the Space Shuttle) turned out to be so expensive that when it failed we couldn't afford to try again. Hopefully the alternate strategy of "start with a cost effective rocket, and try to make it orbital" will be more successful, and even when it does have failures it's a lot easier to repeat a multimillion dollar experiment than a multibillion dollar one.
The reason these Centennial challenges (and the X Prize) are so exciting is that there's a problem with our alternate strategy: revenue. There's a commercial market for orbital rockets, but not much of a market (except for tourism, war, and the occasional science experiment) for suborbital rockets, and nobody wants to start a multi-decade research program if it's not going to bring in any money until the end. If NASA can provide funding for those projects in such a way that they can't be "cheated" into paying for failures (like they were with the X-33), it makes that long term strategy into a short term opportunity.
Hmm... I didn't intend that to be so long; I should shut up now, find a link for anyone who's actually still reading this, and go to sleep. There's a large relevant discussion at Jerry Pournelle's website [jerrypournelle.com]; Pournelle's opinions on this subject don't differ much from mine, he's had most of them longer than I've been alive, and he's better at articulating them.
Re:Keep the proper scale in mind (Score:4, Interesting)
They used cheaper, non-recyclable equipment and rockets, while the U.S. would spend extreme amounts of money designing reusable rockets, and space suits, then there was the excess money used to fish the rockets out of the water for recycling.
With the Russian system it would be a lot easier to implement upgrades because there isn't very much dependency on keeping everything antiquated and compatible. If something doesn't work anymore, you can afford to use it up, then replace the entire system.
Not to say that the 286's that are running NASA arn't good at what they did, back when they were first used, but things change, and become increasingly less useful. Just remember what happened about a year ago. You can only recycle something so many times before it's unusable.
You've almost got it (Score:3, Insightful)
Actually, the Russian system for sending non-people up into space is more efficient and cheaper, too, despite the fact that even the USA is using expendibles for that.
But I'm not arguing with your main point. It's cheaper to design expendible rocke
Re:Keep the proper scale in mind (Score:3, Interesting)
By the way, an illustration of the different cultures of NASA and the Russian space program [oyonale.com] is the kinds of laptops they allow their astro- and cosmonauts to carry onto the ISS. The standard laptop is a Pentium-166 IBM
Re:$20M??? (Score:3, Insightful)
Re:$20M??? (Score:1)
This is only part of the reason. I think the bigger part is that the 2 week time between launch and subsequent relaunch is too short. Not even the space shuttle could qualify to win the X-p
Re:$20M??? (Score:2)
Finally.... (Score:5, Insightful)
2004 is already shaping up to be a banner year for space exploration. I can hardly wait to see what kinds of advancements come next. Competition is healthy, let's hope for a very competitive exploration of the cosmos.
Re:Finally.... (Score:1)
Sivaram Velauthapillai
Re:And do you know why that is? (Score:1, Funny)
For example, instead of...
And instead of...
Fu
A minor mention on NASA's website. (Score:5, Informative)
Here Come The... (Score:1, Insightful)
Re:Here Come The... (Score:5, Funny)
Monkeys are getting too expensive, lets launch people with AIDS or cancer in experimental vehicles! They are expendable, and renewable!
Furthermore, old people should be studied to determine wich nutrients they contain that might be extracted for our benefit...
Re:Here Come The... (Score:2)
Re:Here Come The... (Score:1)
Here comes the Soylent Green...
That's it slashdot... (Score:5, Funny)
Re:Donald Duck (Score:2)
research prizes bring 16:1 investment return (Score:5, Informative)
Research prizes work so much better than many other methods of investment in progress that it's surprising you don't see more of them. On average, you'll see 16 dollars invested in progress for every 1 in the prize.
Here's a good article (plus links to other articles) on why research prizes are a great thing: http://www.longevitymeme.org/topics/research_prize s.cfm [longevitymeme.org]
Reason
Founder, Longevity Meme
Yay for prizes. (Score:4, Insightful)
Re:Yay for prizes. (Score:2)
Re:Yay for prizes. (Score:1, Insightful)
Re:Yay for prizes. (Score:2)
I am excited about this prize program. Bush didn't mention it in his speech a while back, and I figured it would take so
LEO Rockets (Score:4, Interesting)
NASA should also continue its own work on building a truely heavy lifter (non-reusable) that can takes us well beyond earth's orbit with large payloads (or simply lift extraordinarly large payloads).
NASA should be broken up (Score:2)
The the bilions of dollars of budget saved should be split into prizes like the X prize for specific achievements.
Does the FAA design, engineer, build and fly military, passenger and cargo aircraft? Do they bollocks.
Maybe I'm not seeing the whole picture (Score:1)
Even more? (Score:1, Interesting)
bet the religious right won't like this... :-) (Score:3, Funny)
Re:bet the religious right won't like this... :-) (Score:3, Funny)
universities (Score:4, Interesting)
NASA should contract the Navy (Score:4, Insightful)
The Navy can make a ship that is completely self contained.
The Navy can make a ship that generates oxygen and scrubs the CO2 (and doesn't fail either).
The Navy can make a ship that can stay on self-sustained 6 month missions with a crew of hundreds.
NASA can't do more then seven crew for two weeks.
The Navy says "Can do!" and builds the Seawolf [naval-technology.com] class submarine.
NASA says, "huh?"
(picture Conan O'Brien doing his Bush impression)
And if one is at all curious one should ask one's self this question: "When has a military power ever allowed a civilian agency to have more advanced technology than they do?"
Hmm?
I thought so.
Happiness is asking the right questions.
Re:NASA should contract the Navy (Score:1, Insightful)
Do I even have to touch this one? Let me guess you suggest launching rockets using nuclear reactors. It's called rocket fuel for a reason.
Last time I checked the space shuttle wasn't leaking. Also, im pretty sure that making a shuttle out of solid metal is just a bad idea.
Re:NASA should contract the Navy (Score:3, Insightful)
Actually, there are quite a few Nuclear Rocket designs. The most applicable to this situation would probably be NERVA or GCNR. Both could provide heavy lift capability as well as efficient space engines. You'd still need some sort of propellant to convert into plasma, but oxygen and hydrogen are fairly common gasses that can be found all over the solar system.
Also, im pretty sure that making a shut
Correction... (Score:2)
Actually, that should be within the confines of 1960's technology, which says far musch more about our current state now, than the "state of the art" then...
Re:NASA should contract the Navy (Score:2, Funny)
Re:NASA should contract the Navy (Score:2)
The Seawolf has a submerged displacement of 8060t dived, and 7,700t surfaced.
Hmm, if I recall correctly, displaced water is supposed to weigh the same as the item doing the displacement. Or am I on crack? Anyway, that's the closest to a weight measurement I found.
So the two begging questions are:
Obviously, if we stripped out all the weapons systems and everything associated with weapons systems, we'll have a lot less weight
Re:NASA should contract the Navy (Score:2)
Can NASA put 7,700 tons into orbit?
Short of an Orion, the largest proposal I've seen is 3,000 [nuclearspace.com] tons. And part of that is rocket engine weight. If you launched multiple times and constructed it in space, it could be doable. (i.e. The hull in one launch, the reactor and some internals in the next, and the weapon systems and the rest of the internals in the last.)
Can a Seawolf deal with re-entry heats?
If you're going to launch something that big, I think you'd keep it up there. Not much point in a lar
Re:NASA should contract the Navy (Score:2)
If you're going to launch something that big, I think you'd keep it up there. Not much point in a large reentry craft.
Hmm, not necessarily. Maybe. :) The main thing I'm thinking is that you need to be able to send lots of people at once. What's the crew capabilities on the Seawolf? I didn't check. I suppose if we're just talking about a passenger shuttle craft, it doesn't have to be as big as all that in order to carry lots of people. The reason the shuttle has to carry so much 'dead weight' is beca
Re:NASA should contract the Navy (Score:2)
(I'm quoting this fact file [fas.org].)
The Seawolf has a crew complement of 12 officers and 121 enlisted personnel for a total of 133 crew members. She's certainly no slouch.
I suppose if we're just talking about a passenger shuttle craft, it doesn't have to be as big as all that in order to carry lots of people. The reason the shuttle has to carry so much 'dead
Re:NASA should contract the Navy (Score:4, Insightful)
In addition to what the others reminded you of...
The Navy has the ability to jump to the surface anytime their air supply system fails. Well not anytime, they can't when under ice, but most of the time anyway.
The Navy operates in water, which is heavy. They need heavy vessels to sink below the water line. Nasa operates in space where there is nothing to float on, but you need to operate against gravity to get there. I could design a sub and have it work, I couldn't design a spacecraft without a lot more education. My sub would just have walls much thicker than needed, and thus a lot less capacity than a navy sub, you wouldn't want to be on it, but it would work. Spacecraft won't get off the ground if they are too heavy, and that is an engineering restriction that cannot be designed around by overkill.
Mind I'm not stupid enough to be on a sub I design with my current knowledge, but I'm pretty sure it would work.
Maybe solve immediate problems first? Hmm? (Score:4, Insightful)
First Law of Thermodynamics: Energy is neither created, nor destroyed [google.com].
First law of business: Make the consumer believe the product is scarce, then package and sell it in a format that can be controlled (ie. barrels of oil can be controlled, solar roofs can't).
The captured solar energy of a 150 mile by 150 mile square area of Nevada desert would provide the United States with all its energy needs: consumer, residential, transportation, commercial and industrial; oil, gas, coal, electric, etc. combined. Yes. It's a fact.
And we don't need any new technology to do it either. A simple coal, gas or oil fired plant can be retrofitted [boeing.com] with a different heat source.
Do you know how many of these [boeing.com] we could have built for the over $100 billion spent on securing middle east oil? 10? 100? No, _1000_. Yup! Ouch.
But we _are_ running out of oil. And we're running out of it much faster [google.com] than anybody cares to inform [peakoil.net] you.
How much did you spend on heat this winter? On hot water? On AC last summer? On $2/gal gas for your Camry and SUV? It's time we had Open Source Energy, don't you think?
Your friendly neighborhood,
JSMS III
p.s.
For every four barrels of oil we burn, we're only finding one new one.
Again, for every four barrels of oil we burn, we find only one new one.
And again, for each new barrel of oil discovered, we're burning four from the old fields.
Who was the greatest exporter of oil to the United States last year (2003)?
Saudi Arabia? No. Venezuela? Nope. Iraq? uh-uh.
Who was it you ask? Canada! How 'bout that, eh?
Now ask yourself, why? How's that? What the heck is going on?
Re:Maybe solve immediate problems first? Hmm? (Score:2, Insightful)
Um, that's nice. Wake me when we have 100% efficient solar cells, so that we can actually have total "captured solar energy". Oh, and when it's possible to manufacture 22,500 square miles of solar panels without utilizing massive quantities of
Re:Maybe solve immediate problems first? Hmm? (Score:2)
Heh heh, I don't know why you decided to make me your enemy, but your post was dead on. :)
Um, that's nice. Wake me when we have 100% efficient solar cells, so that we can actually have total "captured solar energy". Oh, and when it's possible to manufacture 22,500 square miles of solar panels without utilizing massive quantities of some very nasty materials. Oh, and when the things will install and maintain themselves. Oh, also, and when we cease to have power loss in transmission. Oh, and when we have re
Re:Maybe solve immediate problems first? Hmm? (Score:2)
Free energy as in speech already exists, if you know where to look for it. :)
Generator Joe [generatorjoe.net] has quite a few.
Bowers Power [bowerspower.com] has some as well.
Google knows all [google.com]
Propane generators can usually be powered by natural gas as well. They have lower emissions than gas or diesel generators, are generally quieter, and can also be a lot cheaper in operating costs. I don't know if that makes your TCO lower than just hooking into the power grid, but free energy as in speech is here and now. But it's not free as in be
PRON in space (Score:3, Insightful)
Zero G Sex (Score:2, Interesting)
There would be a ri
I would love to be proven wrong about NASA but... (Score:4, Interesting)
The problem is manned space-flight of any kind (Score:3, Interesting)
Manned spaceflight is THE objective (Score:2, Interesting)
Science with small, cheap and expendable unmanned probes and orbital labs is useful because it will help us to prepare for the manned flights which, to my mind, are absolutely essential for the future of the human race.
Bush Petitions the European Space Agency (Score:1)
[Bush descends from Airforce One on a runway in Geneva]
Bush: Hello!
[pause]
Bush: Hello!
Frenchman: Allo! Who is eet?
Bush: It is George W. Bush, and these are my presidential aides. Whom am I addressing?
Frenchman: A representative of the European Space Agency.
Bush: Go and tell your superior that we have been charged by God with a sacred quest. If he will give us food and shelter for the night, he can join us in our quest to land a man on Mars.
Frenchman: Well, I'll ask him, bu
Re:Bush Petitions the European Space Agency (Score:2)
Contracting and Oursourcing (Score:2)
Use prize to save Hubble (Score:5, Insightful)
nuclear propolsion, anyone? (Score:3, Interesting)
As safity goes, two or three reactors crashed to the ocean within a decade should not make any big difference with what we already have there. And I think nuclear reactor based engines should be much safer as there is no risk of self-ignition based explosion like we have on a regular basis with Shuttle boosters and similar ones. You cannot stop ignition in modern engine once it's started. If anything goes wrong the reactor can be stopped immidiately (as well as the water or waterver liquid vaporation process) and the whole thing can land safily on a parashute.
Did I say that nuclear engines will be multiple times usable? Ok, Now I've said that. And that's a big plus to make the whole orbital business cheaper.