Currently there is 450 ton international space station with crew of 6 which has been continuously occupied for 12 years which has been flying at around 400 km above Earth [at orbital inclination of 51 degrees- it's path will fly from 51 degrees latitude, north and south]. It flies over 80% of the Earth’s surface, it has been largely funded by US taxer payers, and has involved many astronauts from different countries. Russia has been a major
partner, and Russia has been solely responsible for getting crew to the station, since the end of US shuttle program. Last month, SpaceX flew it’s first non-experimental cargo flight to ISS, a notable event occurred in which 1 of it’s 9 engines failed, yet the Falcon-9 was still able to successful deliver cargo to ISS. Other countries- Japan and European space agency- have delivered cargo to ISS, but for next few years, only Russia flies crews to and from the station.
International Space Station [ISS} involves about 1/2 of NASA's manned space program budget, the other half is being spent to develop a rocket, which eventually is planned to be larger than the Saturn V [the largest and most successful rocket ever built, which landed crew on the Moon].
It was the Saturn V rocket which allow the US to send crew to the Moon, in less than decade or “before the end of the decade” [the 1960 decade] and
beat the Soviets to the Moon. A vision offered by JFK [in a famous speech] who later assassinated, but this goal was continued by other US presidents. Ultimately, the Saturn V [the workhorse of Apollo] delivered a total of 12 crew to the lunar surface, it had 11 successful launches which
includes the launch of first US station space station, Skylab, then the
Saturn V was scrapped, to be replaced with the Shuttle program.
So after few decades of the Shuttle program, NASA is returning to idea of developing a heavy lift rocket. A 130 ton payload to Low Earth Orbit [LEO]
and Saturn V was about 100 tons to LEO. So NASA is planning to make
the largest rocket ever made and could take over a decade to develop it.
And this program is called SLS [which critics call the Senate Launch System, but it's official name is the Space Launch System].
I think the 130 ton payload rocket will never fly, but instead will be cancelled before this stage of rocket development is achieved- I would like a reality in which NASA could develop a relatively cheap, reliable heavy lift rocket- something like or better than the Saturn V- but I think it’s not likely in the cards.
The SLS is being developed incrementally with first development version being a 70 ton to LEO rocket, which btw, is bigger than any currently available- and could be the largest rocket available in the world at that time. But this first launch is vaguely scheduled in 2017 with the 130 ton version available in sometime in 2030′s.
http://en.wikipedia.org/wiki/Space_Launch_System
Wiki, criticism:
“Others suggest it will cost less to use an existing rocket (Atlas V, Delta IV, Falcon 9) or proposed derivative (Falcon Heavy), with on-orbit assembly and refuelling as needed, rather than develop a new launch vehicle for space exploration without competition for the whole design. Mars Society founder Robert Zubrin suggested that a heavy lift vehicle should be developed for $5 billion on fixed-price requests for proposal, and SpaceX CEO Elon Musk said his company could build one for $2.5 billion.
The Augustine commission proposed an option for a commercial 75 metric ton launcher with lower operating costs, and noted that a 40 to 60 metric ton launcher can support exploration. ”
Btw, the Falcon Heavy is a rocket which could lift 70 tons to LEO- and Atlas V, Delta IV also has possible variants on the drawing table, capable of around 50 to 60 tons.
And Atlas V and Delta IV currently are the biggest US launch vehicle- both these programs were developed by US military to deliver US defense satellite, with total develop [both launchers, in program called EELV] for 2 billion dollars- most of this money paying for launches- it was agreement to buy a certain amount launches at agree upon prices]
The Falcon 9 development cost was privately funded, and Elon Musk
says would built Falcon Heavy if given government funding of 2.5 billion.
And keep in mind, NASA is spending about 3 billion a year for it’s 70 ton rocket [which is suppose to evolve into 130 ton] which the 70 version might be ready in 2017. So NASA already spent over 6 billion, and by 2017 will have spent well over 12 billion.
And 2.5 billion is less than 12 billion.
And the 2.5 billion funding would be like EELV, would be agreeing to buying launches before starting to building the rocket.
The problem with large rockets [anything over 50 tons] is the lack of market [this size rocket is not needed to launch satellites].
It is possible Elon Musk will build it’s Falcon Heavy without such “market guarantees”- build it they come sort of thing, which has been his approach with developing the Falcon 9.
For the time being, NASA is going to spent 1/2 of budget it’s human spaceflight on ISS and 1/2 on developing a Heavy Lift rocket And Human Spaceflight is a bit less than 1/2 of NASA’s total budget.
What I think, and is mentioned in Wiki criticism of SLS program [above]
is what NASA *should do* is develop a system of refueling spacecraft in space. Which is even vaguely a new idea, it was the assumed path of getting to Moon, prior to Saturn V. The advantage going to route of the Saturn V, was it was a faster way to get to the Moon. Using one rocket, which launches crew, which can land on the Moon and return safely.
Instead of multiple rockets, and having system of docking and refueling a spacecraft- there little certainly of how one does this *exactly* and there is still some doubt about how exactly one does this- this uncertainty
would translate into taking more time.
But the SLS path of getting to the Moon after 2030, is hardly the definition of quick. And developing a system of re-fueling spacecraft could get us to the Moon by 2020- and in total costs be much cheaper.
And what I am saying is not unknown or even really debatable, but it
can be ignored and denied by NASA’s bureaucracy. I just don’t think it ignored forever- and why I think that ultimately the 130 ton SLS will never fly.
If you have a system of re-fueling spacecraft in space [and one could say that ISS has been doing this for 12 years- it needs to be re-boosted or fall from the sky] then one does not need 100 ton lift rockets to get to
the Moon- or even Manned Mars. Instead one could go the Moon with the existing rockets. Existing rockets which which in addition to US, many countries already have: Japan, China, European space agency, and India*.
*”Of seven launches over nearly 12 years, India’s largest rocket has notched only two successes and one partial success. The last fully successful flight occurred in September 2004.
But, ISRO is, if nothing else,doggedly persistent. In April, the Indian space agency will attempt to launch a GSLV rocket fitted with its second domestically produced cryogenic upper stage. ”
http://www.parabolicarc.com/2012/12/09/india-to-try-again-with-cryogenic-upper-stage-after-long-gap/
Why go to the Moon [or Mars or anywhere with humans]. This gets into the whole human vs robot debate. Which I find *boring*.
I make it as short as possible. We would not have a manned space program, at this time, if we did not have a robust commercial satellite market [robots], but we would not have a planetary robotic exploration program without a human space flight program.
Or people arguing for robot only exploration of space, argue it is cheaper, but in long term it much more expensive AND the public would
not support it. Human spaceflight in long term can be vastly cheaper and
it’s something the public wants.
And key aspect of why robots can be seen as cheaper, is you can throw away the hundred million dollar robot- rarely do you need to bring the robot back to Earth.
Getting back to Earth is fundamentally, relatively cheap. And it can made a lot cheaper. If you make it cheaper, using humans is cheaper than robots.
A key aspect of returning to Earth cheaply is having rocket fuel available
in Space. If rocket fuel were available on the Moon, even it hideously high price, having people going to the Moon would be 1/2 the current costs.
The key to having rocket fuel on the Moon, is having water on the Moon.
There could be a billion tons of water on the Moon. A billion tonnes water on Earth, is all over the place. It rains this much in rain storm.
It’s a small pond or lake. But on the Moon there could concentration of water in polar regions which if added all up, could exceed a billion tonnes. But all that needed on the moon is less than 1 million tonnes.
A 100 tonnes would enough for lunar program. And as little as 10,000 tons could make it economically viable to mine and transform the space
environment.
What is needed is for the polar region of the Moon to be explored to determine whether there is minable [can mine somewhere around 10,000 tons fairly easily which includes mine this amount within a short enough period of time- years]. You need to mine enough, in order to make it economically viable- to pay the high costs need to start such an operation. No different than in order successful mine off shore oil you need enough minable oil. It’s around that scale of cost development,
though oil has ready market for it’s product, and lunar water is a bit more complicated in terms of available market.
So a ton of lunar water is fair cheap at million dollars. And obviously
a million tons of water at such price is trillion dollars. And billion tones is 1000 trillion dollars. One can’t expect to sell million tons for 1 trillion dollars- market factors don’t work that way, maybe 100 billion, but that
getting ahead of things. With only 10,000 tons at million per tons, one only has gross of 10 billion. So it’s trickier to pull this off, but within the realm of possible. NASA doing this, dream on. But private markets could do it. And this is what I am talking about.
So if you had lunar water commercially mined and selling water at million dollars of ton. Which may be 2 or even 3 million ton, one has 1/2 the cost of crew going to the Moon because there would rocket fuel available. But one doesn’t even need to mine lunar water and make rocket fuel, and sell it, one manage lower cost by around 1/2, by shipping rocket fuel from earth, at low cost. Or having rocket fuel available on the moon for 20 or 30 million a ton makes going to the Moon a lot easier and therefore lower cost- even if you paying fairly high price for the rocket fuel.
The reason any commercial provider of rocket fuel would charge a lower price, is to increase the demand for rocket fuel.
If you had unreasonably high demand for lunar rocket fuel, one could less it for less than 10,000 per ton, but 2 million per ton for rocket fuel [1 million or less for water] would be reasonable considering market demand within decade or two of time.
Or before 1 million tons of water [out of possible 1 billion tonnes of more]
is mined and sold the price could drop by 1/10th or 1/20th, but by the time the millionth ton is mined, could take several decades before this much demand is reached. But getting to point of any rocket fuel at whatever could seen as a reasonable price, is the biggest cost reduction to sending crew to the Moon- it makes humans cheaper than robots- but of course you still want robots, you lowered their costs by some amount and made them even more useful/valuable.
Or the big problem with mining lunar water is market size- humans not robots would be biggest market element. Having some kind commercial lunar mining operation run solely by robots, is pointless and non-economical- it’s self defeating. Though using as much robots that make economical sense, is a good idea.
Having tel-operated machines using workers on Earth controlling them would probably a must for any business plan. But the machines would assisting, rather than the myth that the use of machines are going replace humans completely.