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LiftPort Wants To Build Space Elevator On the Moon By 2020
Zothecula writes "When the late Neil Armstrong and the crew of Apollo 11 went to the Moon, they did so sitting atop a rocket the size of a skyscraper that blasted out jets of smoke and flame as it hurtled skyward. For over half a century, that is how all astronauts have gone into space. It's all very dramatic, but it's also expensive. Wouldn't it be cheaper and easier to take the elevator? That's the question that Michael Laine, CEO of LiftPort in Seattle, Washington, hopes to answer with the development of a transportation system that swaps space-rockets for space-ribbons. LiftPort ultimately wants to build a space elevator on Earth, but the company isn't planning on doing it in one go. Instead, Laine and his team are settling for a more modest goal – building an elevator on the Moon by 2020. This is much easier. For one thing, there’s no air on the Moon, so no icing problems. Also, the lower gravity means that no unobtainium is needed for the ribbon. Kevlar is strong enough for the job. And finally, there’s very little in the way of satellites or debris to contend with."
They're forgetting the single most important part of a space elevator: It needs to actually be useful.
What are we going to do with a space elevator on the moon? We don't go there for a very good reason: Its expensive as hell. Making the cheap and easy part a little cheaper an easier isn't going to change the fact that the entire rest of the trip is prohibitively expensive.
It's like your friend moving across town to be closer to you, but he lives in Seattle and you live in London.
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There's plenty worth lifting off the moon, if we can do it. There's water for starters, plus plenty of raw materials for making high quality metals, ceramics, semiconductors and so on. If you can send them into a low Earth orbit then you'll probably find you can beat the per-kilo costs of launching similar material from Earth, what with the big gravity well and atmosphere and all. If you can undercut an entire planet then I'd call that a worthwhile business opportunity. Can't see how a space elevator helps much, but there's plenty worth lifting off the moon.
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The mining machines wouldn't necessarily need to be: massive, transported via the tether, and/or come down fully assembled. Not everything has to start out on massive scales. For instance consider the state of global shipping back in the 18th century then compare that to the early 21st. Or farming in the 18th vs. 21st. Normally things start out small and gradually build out as technology and resources develop. Staging things is simply an engineering problem which if Curiosity is any indicator we seem to be getting pretty good at. Even during the Apollo missions we were dropping some pretty serious hardware down onto the moon. Powering these machines can come from any number of technologies from mundane to exotic. We already have well proven solar and RTG technologies, there are a few rather interesting possibilities using in-situ resources as well. For instance using the newly discovered water with the aluminum in the regolith to produce hydrogen for fuel. The Aluminum Hydroxide byproduct has its own interesting uses. The obvious one is of course simply using the mined He-3 for fusion power (whenever we get that one figured out).
Few grand adventures into human frontiers are ever "practical" initially and that unfortunately prevents people from seeing what humanity's pioneers and explorers see. In the 1800's no one got what Charles Babbage saw. During the first half of the 1900's very few saw what Konrad Zuse saw. Today no one can miss it and everyone demands it. People too often are quick to see problems as "too hard", too near-sighted to see possibilities, too self-centered to appreciate the benefits to others. You might not get to holiday on Utopia Planitia, or sail the methane seas of Titan but wouldn't it be awesome to initiate the projects now that make that a reality for your progeny? Both incomprehensible business opportunities and human delights await us on this next frontier. What are we waiting for?
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Seriously, name one thing that's on the moon that you think is worth trillions of dollars, keeping in mind that its surface is entirely covered in rocks.
Rocks in space.
Seriously, look at the price of titanium on earth - about $7 US per kg for commodity ferro titanium. Look at the price of titanium in low earth orbit - according to Wikipedia, it costs about $4300 US per kg using a Proton rocket (the cheapest non-subsidized launch method listed). There's quite a lot of titanium on the Moon, as well as aluminum, iron, and magnesium.
That's why we want to mine asteroids and the Moon - getting material out of the Moon's gravity well is a lot easier than getting it out of Earth's gravity well (and of course asteroids generally don't have an appreciable gravity well).
If we want a space station that's more than just a few tin cans glued together and can protect its inhabitants from radiation, we need building materials. We can get many of those materials from the Moon. We'd have to learn how to process and smelt them there first, of course, but you have to start somewhere.
He3? Well, maybe later. You don't build a gas station before the invention of combution engines. Water is more valuable, if it can be collected in any serious amount, which we still don't know.
That said, I have my doubts that anyone could put a space elevator on the moon in 8 years. It's just not going to happen. The design phase would take at least half that time.
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