People

Here are Engineer Dehyar and Sabri, whom I worked with in 2003. At that time one of my tasks was to go through the International Building Code and identify passages for translation from English. The two sections that seemed useful were 1) the approach to exiting design, and 2) post-construction testing of concrete structures (a lot of buildings were going up at the time with no oversight at all!). We also discussed land use regulation, although I warned the team away from adopting American-style zoning. When I visited this last week, they had just completed a zoning plan for Kabul. I look forward to seeing the result!

On the day that I visited, Eng. Dehyar and Sabri were working on accessibility design standards for public and commercial buildings. In a city with so many disabled people, I really hope this policy gets implemented.

Khwaja Muhammad Nader was one of the bad-guy leads in the movie “Osama.” He is a total sweetheart!

And just an odd note: this is an image from the Roshan Mobile-phone company website (see here). Separated at birth? At least you can see why so many Afghans think I am Afghan. It isn’t just the beard! One explanation is that Alexander’s army left a lot of Greek descendants in what are now northern and eastern Afghanistan.

It is hard for tourists to resist photographing women in burqas. As I mentioned in week one, their meaning is very ambiguous now. And elimination of burqas (and chaduri for that matter) might mean very little in terms of gendered power-relations. For the outsider, even though these women were just conversing as they walked with their children, I feel a strong sense of uncertainty being near people whom I cannot see. Venice must have felt like this before Napoleon banned the capes and masks that were worn by men and women alike until 1798. Members of the Revolutionary Association of Women of Afghanistan found burqas to be very useful in the 1990s, an perhaps still are using them now.

Images and text (c) 2006 Pietro Calogero.

Kabul old and new

I arrived in Kabul on Weds, May 31, two days after the worst rioting in the city in several years. News of the riot began to emerge several hours after I had begun my journey, so it was disconcerting to be in transit, glimpsing news in airports to find out how bad the situation was. By logging into wifi hotspots I could access BBC news, and saw that the situation stabilized quickly so I continued on to Kabul. This is the first time I have been back since October 2003.

Right now Kabul is a shocking juxtaposition of old an new. In the picture above, the house on the left was blasted apart during the factional fighting between mujahid forces in 1992-1994. The blue and white curtain serves as a screen for squatters who are living in the shell of the house. The house on the right, just next door, is brand new and palatial, perhaps 400 sq.m. (4000 sq feet). This neighborhood is the transition area between Deh Mazang and Karte-4, which was a wealthy area in the 1970s, and the families who fled retained title to their land. As they return from the United States, Germany, etc., house-by-house the neighborhood is re-gentrifying. Unless the squatters in the forground remain as house-staff, they are likely to be displaced when the ruined house is rebuilt.

Commercial reconstruction is also proceeding. In this case shopowners have restored individual bays in a large commercial building whose upper storeys remain wrecked and unstablized.

But just down the street, this is a sample of new architecture. As urban design, it looks good: low-rise, high-density, residential over commercial. The balconies provide a nice layering of facade texture, and offset the loss of transparency of mirrored windows. Reflective glass is a good energy-efficiency strategy here, and maintains traditional Afghan domestic modesty while providing a lot of daylighting and eyes on the street.

It is interesting to see what is left as this neighborhood is being rebuilt. In this area there are new lampposts, but this old one was left as a piece of highly expressive sculpture. Again, this damage dates from more than twelve years ago. Perhaps the most psychologically damaging experience for Kabulis was to live among the wreckage of that horrible moment for another ten years. Neither mujahidin nor Taliban did any reconstruction in this area, so it remained an inhabited ruin where wood and metal hardware were stripped from abandoned buildings, leaving very barren shells.

But there is a lot of hope in Afghanistan now, even with the rise of insurgent attacks across the country this spring. On June 1 I met Roshanak Wardak, a member of the upper house of Parliament (Meshrano Jirga). She is an OBGYN in Wardak province, and apperently the local leaders decided they wanted her to represent them. So various candidates financed from Kabul held all sorts of events and essentially sought to buy votes, while locals put together informal gatherings for her. On the day that I met her she had just come from a meeting with President Karzai in which he asked the MPs why they had rejected the latest budget (fiscal year 1385, solar hijra calendar). She identified a variety of items in detail, and the Ministry of Finance will re-evaluate. It seems that the government (President and Ministers) are having difficulty adjusting to having a powerful Parliament which they must answer to.

That evening, Dr. Wardak returned to her province to deliver more babies. Apparently, expectant mothers are now trying to time their births for when she is back in her hospital!

I wanted to show this photo, but not first, because it does represent some of life in Kabul but it runs the risk of reinforcing a stereotype. They boy on the left pushing a wheelbarrow: yes, child labor is widespread. This is a serious problem because it deprives children of time for education–both class time and homework. Like housing, this is a complex issue that needs to be approached in an integrated manner. The woman on the right: yes, women do wear burqas in Kabul now, although much less than in 2003 from what I can see. And as a more or less voluntary choice, wearing a burqa now can mean many things, including a woman who just does not want to be stared at by men.

I took this photo from one of the new pedestrian overpasses in the city center, initially to show the contrast between the old neighborhood of Deh Afghanan on the left and the new commercial building on the right. But the foreground view of men in the street is almost a Breugel-like illustration of a day in the life of Kabul. On the left, yes, a man with one leg; but in the middle, a man on a mobile phone; and on the right, three young men who look like they are just leaving school or work. On the far side of the street you get some sense of the intense sidewalk-commercial activity that occurs in commercial areas.

Images and text (c) 2006 Pietro Calogero. This page updated: 10 June 2006

Colonizing Luna, Part 7: Remote Operations

REMOTELY-OPERATED MACHINERY

Originally written: 8 August 2005. Previous | Overview | Next

Beyond the earth’s atmosphere, most exterior operations will be done using mechanical remotes. Machines can operate outside without worrying about radiation shielding, pressurized suits, or extreme variations in temperature. The main problem is how to control and guide them for non-routine operations. The simplest solution is to have a nearby human operator. Good remote-guidance and stereo-video interfaces will need to be developed, but only once: the same interface could be used for a variety of remotely-controlled machines working outside of satellites, vehicles, and on the Lunar surface. When signal-delay is not a problem, such as for simpler tasks that can be partially-automated (like digging), Earth-based operators can be used at lower cost.

Standard operator interface:

On the remote itself, this includes stereo video cameras and mechanical arms and hands, probably proportioned close to those of the human operator. Therefore the operator can wear stereo-video goggles, and ‘mirroring’ armatures on their arms and hands. Or perhaps a simpler interface can just use video-screens, keyboards and joysticks.

Crab:

This is a small, very maneuverable remote with fine manipulator hands. It can be used for repair and general-purpose external work.

Since they are small enough to go through airlocks, crabs can be adjusted frequently and used for moving small items into and out of habitable environments. One problem is power-supply on a small machine. Depending on context this could be photovoltaic panels or fuel cells, but for local work it could also be plugged into an electric power cable — essentially an extension cord.

Crabs can also be used for public-relations by NASA. Several units can be donated to the United Nations to be used for demining in post-war zones.

Roller Slab:

This is a large, slab-shaped trusswork with wheels at the four corners, and rolling-pin shaped flywheels encaged within. The flywheels will be iron disks fitted onto an axle and locked together. Altogether, roller-slabs would mass many tons, most of it being the flywheels.

The Slab is ‘recharged’ by hooking up to an electric supply and spinning up the flywheels; I suppose it could also operate on an electric power cable, but the amount of current might be a problem. For simplicity, each wheel should be driven by a separate electric motor and the motors draw current from flywheel-driven generators.

I think this should be the basic platform on which both diggers and ore trucks are built. Ore trucks would include tilting hoppers, as dump trucks do. Diggers would include equipment which is also powered by the flywheels. The digging equipment could be designed as a modular attachment that can be added to any standard Slab.

Colonizing Luna, Part 6: Manufacturing & Mass-Driver

MANUFACTURING

Originally written: August 3, 2005. Previous | Overview | Next

Bulk manufacturing on Luna will need to be done by automated or remote-controlled machines. Humans-in-spacesuits is too costly, as are pressurized, breathable environments. To control for temperature and dust, factories probably should also be enclosed, so again, the geodesic dome design is easiest for maximum area covered using minimal materials. Also, in some cases it may be best to pressurize the factory with an inert gas such as nitrogen or argon; that way ambient gas temperature can also be maintained, and equipment will not have to be engineered for hard vacuum.

Another big issue is getting product back to earth. The launcher mechanism will be described in the next section. But whatever is launched will need to land intact on Earth. I recommend atmospheric-entry gliders, similar to the X-38 or Shuttle Orbiter design. For efficiency, these should be remote-operated, so it is probably easier to have them land on skids in the ocean.

ELECTROMAGNETIC MASS DRIVER:

Originally written: 3 August 2005. Previous | Overview | Next

This idea was already developed and tested by the Space Studies Institute in the mid-1970s. See the Wikipedia summary.

This is a large mag-lev track, with a huge mesh cradle mounted on the track. The loading/unloading point on the track is nearest to the Luna base.

The cradle accelerates its payload to Lunar escape velocity and releases the payload in a tangential trajectory. The trajectory will be bent somewhat by Lunar gravity in a spiral form as the payload moves up and out of the Lunar gravity-well. So the launch-point and speed need to be calibrated so that minimal energy is needed to manage the path of the payload once it is launched.

The mag-lev track will probably be the main consumer of electricity, hence the need to store electricity in compusators.

Catcher function:

This is essentially the reverse of the launcher function. The cradle accelerates to match the decaying-orbit velocity of the descending payload, which makes a low-energy landing on the cradle. Then the cradle can use the electromagnets to decelerate to a stop.

The launcher performs several functions:

a. Send drop-gliders back to Earth to deliver manufactured product.
b. Send manned vehicles back to Earth.
c. Launch very large interplanetary probes.
d. Receive supplies and, if safe, receive manned vehicles.

Colonizing Luna, Part 5: Local Resources

LOCAL RESOURCING:

Originally written: 8 August 2005. Previous | Overview | Next

A solar oven seems the obvious way to melt and separate Lunar ore. Beyond the initial Earth-built small equipment, Luna-built reflectors seem easy to manufacture, so at least that part of the system can be scaled easily.

The separating system might be more difficult to create on Luna. Don’t know the technology well enough to predict.

 

Lunar soil will yield lots of silicon and oxygen, and some metals and water.

The probable local deficit will be hydrogen, carbon, and nitrogen. Needed for organic processes and materials. Possibly enough hydrogen if surplus water is found.

Hydrazine will be hard to make locally beacuse it is N2H4. At some point in the future it may be easiest to gather ammonia (NH4)and hydrocarbons in bulk from gas giant atmospheres to bring nitrogen and carbon to the moon.

Xenon: useful in ion engines because of its high atomic mass. Next-heavier noble gas is radon, which is not so good because it is radioactive. However, if thorium is used for nuclear power, I think radon is one of its fission byproducts; so it may be more easily available through other processes.

PAVERS: Even if major products will be glass mirrors, photovoltaic wafers, and semiconductor chips, it is likely that there will be surplus SiO2/SiO4 ‘waste’. This can be formed into pavers to lay onto the surface and cover the dusty natural surface in high-traffic areas. Tracking dust into habitats and other areas with mechanical working parts is potentially a serious problem, so glass paving may be needed in large quantities.

In addition, a prodigious quantity of mirrors should be produced which can be assembled into several in-crater telescopes of enormous size. The mirrors should be mounted on adjustable stands so that the overall reflector can be refocused north or south to view a band, rather than just a single thin track directly overhead.

The first telescope will probably be built near to the south polar base, perhaps as a prototype for the subsequent telescopes to be positioned at different latitudes.

MOBILE MIRROR-ARRAYS: 20m reflectors could be mounted on standard creeper-slabs, together with a solar array, so that they can creep northward under their own power. They can reposition themselves within craters or sloped terrain to point further northward or southward; multiple units could also synchronize as very large arrays.

 

So again, the first thing to refine and use in large quantities is metal, to make the roller-slabs and other structures. Sufficient glass will be produced incidentally.

 

STORAGE:

Refined compounds will accumulate at a faster pace than it can be used, at least in some cases. Some things will be dangerous, like thorium, uranium, and nuclear waste shipped up from Earth. For long-term storage, these should be dissolved into molten silica, formed into blocks, and stored in piles covered with about a meter of plain soil (to pad against impacts).

Water-ice will also need to be shaded from sunlight so that it does not boil off. Sublimation may also be a problem, in which case ice may need to be stored in tanks.

Colonizing Luna, Part 4: Mining

MINING

Originally written: 8 August 2005. Previous | Overview | Next

Mainly this will include electric-powered, remote-controlled diggers and conveyor trucks or belts.

The first target for mining is to grade a level path for the maglev launcher track. This means that the mined material will not be specific; it will be generic Lunar soil, carried to the solar furnace.

A later mining target will be craters that need to be formed into parabolic surfaces to house massive telescope reflectors.

Available materials

What are the main elements and compounds available at the Lunar surface?

TiO2 (titanium oxide). Obviously, Ti is a good lightweight building material.
FeO2, other iron compounds. Strong, and magnetic. Cobalt might be better, but iron can be used for the mag-lev system.
H2O (ice). Vital for life-support systems, and if separated into H2 and O2, a good chemical propellant.
SiO2 (quartz, quartzite, rhyolite). Good for lenses and semiconductors.
SiO4 (basalt).
K (potassium)
Ca (calcuim)
Al (aluminum). Like titanium, it is a good structural material. Perhaps alloys with other materials will enable aluminum to remain ductile at low temperatures.
Mg (magnesium). Yet again, a light & strong metal. And again, alloys may maintain ductility or conductivity through a range of temperatures.

Missing elements

The main missing elements are nitrogen and carbon. These are needed for organic compounds used in life-support systems, plastics, and other flexible fabrics.

I do not know this technology well, nor am I sure that anyone knows it. The obvious problem is that on earth, the equipment used for mining and conveying is massive. How do we scale up from Earth-built small equipment to Luna-built, industrial-scale equipment?

Prospecting will also need to be done, and this means the location of mining will change and be difficult to predict. Mined material probably will need to be transported to a fixed-location refinery, so either conveyors will need to be extended out in various directions, or trucks will need to be used, or both.

The diggers and loader trucks can probably be controlled from Earth, since the functions are simple and the time-delay will not be a problem.

Politically, it may be most acceptable to mine the far-side since the mining will be messy and ugly to environmentalists who may complain about scarring the visible side of the moon.

Colonizing Luna, part 3: Energy

ENERGY COLLECTION, GENERATION, STORAGE

Originally written: 8 August 2005. Previous | Overview | Next

Initial:

Earth-built photovoltaic panels, batteries, fuel-cell/electrolysis pairs.

Secondary:

Luna-built photovoltaic arrays, parabolic solar ovens for manufacturing, possibly thermoelectric.

Massive, solar-powered compulsators; alternators capable of delivering massive pulses of electricity.

PV ARRAYS

At present the most efficient photovoltaic cells are still p/n-doped monocrystalline silica wafers. Hopefully the necessary rare metals are available on Luna for their production. Large PV arrays should remain low low and wide so that flying vehicles do not hit them. Near the south pole, one simple geometry is a circular fence of outward-facing, fixed-position panels. These can be placed on hills, and around both habitats and compulsators. This simple, no-moving-parts configuration is inefficient, but its simplicity and reliability may offset the cost once PV wafers can be manufactured on Luna in large quantities.

FLYWHEELS FOR COMPUSATORS AND MACHINERY

Initial flywheels will be disks of iron just light enough for an astronaut to lift (carefully) under Lunar gravity. These disks can be stacked together on spindles, like gymnastic freeweights, to make high-mass cylidrical flywheels. In addition to powering compusators, flywheels can store mechanical energy for direct use in machinery such as roller-slabs.

The massive compulsators needed to drive the mag-launcher will require flywheels the size of gravitats. These should also be situated in craters, so that if they malfunction and disintegrate the debris will impact the crater walls, and not threaten the rest of the base. The spindle may include an electric motor/generator assembly, or a separate ‘spin-up’ motor if the winding of the compulsator needs to be a different geometry.

SUPERCONDUCTORS

The temperatures in the lunar shade are low enough for ‘high-temperature’ superconductivity to be sustained so long as materials are insulated from heat-conduction and perhaps refrigerated slightly. This makes Meisser bearings, mag-lev tracks, and the movement of large amounts of electricity feasible. At this point the main constituent elements in higher-tempreature superconductors are either copper, titanium and oxygen for cuprate-perskovite materials, or ytrrium (La), copper, oxygen, and barium (YBCO). So an important early feasibility-test will be the availability of these materials and their refinability.

Colonizing Luna, Part 2: Gravitats

GRAVITY-HABITAT; the ‘GRAVITAT’

Originally written: 8 August 2005. Previous | Overview | Next

Luna’s gravity is too low for humans to maintain long-term health. Therefore, like long-term residents of microgravity environments, lunar settlers will need to live in ‘gravitats’ where gravity is simulated by spin (centripetal acceleration).

The good news is that the design requirements for lunar gravitats and deep-space gravitats are very similar, so many lessons and techniques can be learned once and shared. Science-fiction authors have proposed that large types of gravitats such as O’Neill cylinders be used for multi-generational voyages. I think we can start small by working out all the problems and details of gravitats on Luna and in low-earth orbit (just as 1950s sci-fi artwork proposed). Once we have a reliable model, an engine cah be mounted on the spindle-axis of the gravitat to push humans out on very long-term missions. These might not be the first missions to Mars (that could be done using capsules, especially by a dedicated nation-state such as China). But a mobile gravitat could support a multi-year mission to the Jupiter and Saturn systems.

Initial gravitat:

This is a dumbell form, about 100 m (300 ft) radius.

A pair of pressurized vessels are spun around a central tower. The vessels probably will be the upper stages of heavy-lift vehicles. They will be suspended by cables or rigid swing-arms. Access/egress is most difficult, either by stopping the spin of the whole habitat or by an EVA climb up/down a ladder to the central spindle.

Full gravitat:

This is a “bicycle-wheel” form.

To eliminate vertigo caused by inner-ear sensation of the coriolis effect of spin, I think a full gravitat will have to have a radius of 500 m, and therefore a diameter of 1000m (1 km). The rim, 3142 meters in circumference, could begin as an open truss-work that gets filled in by opposing/balancing modules over time. The spin rate would have to be about 1 rpm, thus a speed of almost 200 kph at the rim.

The ring would be a sequence of links and modules. The links would be open trussworks attached to the radial suspension cables, and attached to each module. To access the ring from the Lunar exterior, one must board a “synchro railcar” located in a trench underneath the structure. The railcar is accessed via an underground passage network, which leads out beyond the rim and inward to the central hub. The railcar would accelerate up to matching speed with the ring and mate with an airlock in the bottom of a link-truss.

The suspension cable network consists of upper and lower planes of radial suspension cables, cross-tied for redundancy. Thus the overall appearance of the gravitat would be very similar to a bicycle wheel–except the tires would look like a string of sausages.

Pressurized Modules:

Modules will tend toward a generic, standardized construction. Habitable space will be enveloped by at least two if not three outer wrappings, held rigid by internal gas pressure. These sacks wrap around a rigid trusswork which is connected to the link at either end. Human-occupied space is built as decks within that truss.
Insack: The innermost sack is held rigid at human-comfortable atmospheric pressure, which I think is at least 800 mB of nitrogen-oxygen mix.
Midsack: I think the second sack would contain argon gas, at maybe 400 mB; it serves as an emergency backup if the inner bag fails.
Outsack: The outermost sack is coated with material to reflect alpha-rays, and very tear-resistant to absorb micrometeorites. Whatever it is inflated with should be a good beta- and maybe gamma-ray absorber, but the pressure must be low enough that the bag can deform to absorb impact energy without putting too much strain on the fabric.

The interior each module has three decks, listed from top to bottom:

1. Topside: built on top of the truss. This deck is open to the fabric roof of the insack. Hydroponics, recreation, informal meeting areas. Include a projector to show stars, images, movies. (slightly less than 1g)
2. Main deck: work labs/stations, sleeping and showering (1.00g)
3. The hold: hydroponics, water recycling, tanks and other heavy equipment (slightly more than 1g).

Assembling the first full gravitat

This is a massive structure, and the vast majority of the material needed to build it must me extracted and refined on Luna. (The main worry here is the flexible sacks. What can they be made from? Probably a woven metal mesh, coated to make it airtight.) This means the full gravitat will not be built until refining and manufacturing facilities on Luna are well-developed.

Protective Covering Dome:

Permanent gravitats should be placed under protective cover to shield from micrometeorites, hard X-rays, and mistargeted landing vehicles. As resources permit, the domes should be:

a. A lightweight, open geodesic framework which anchors the upper end of the gravitat-spindle. This initial dome can also serve as the construction-scaffolding for a second, heavier, outer dome.

b. A heavier dome which includes enclosing panels.

c. A very strong dome which is buried over with soil or refinery slag.

Locating the habitats in small craters will provide a head-start in terms of lateral protection, and reduce the amount of material needed for covering dome assemblies.

Long-Voyage Vehicle Development:

The design needs of a permanent Lunar gravitat are almost identical to those of a long-voyage vehicle. Either the dumbbell or bike-wheel design would serve, with fuel tanks, engines, and communication equipment attached to the central spindle. Given a large enough, powerful enough launcher, the whole vessel could be flung out from the Lunar surface at escape velocity in one or two pieces; minimal in-flight assembly required.

Colonizing Luna, Part 1: Bootstrapping

Originally written: 3 August 2005.

A. From 2006 to permanent, productive lunar base

The good news from this spring was NASA’s decision to replace the space shuttle with separate, simple-configuration heavy-lift and crew-lift vehicles, Ares I and Ares V. This should lower both the cost and risk of getting from earth’s surface to low earth orbit (LEO). It is also very encouraging to see successful private projects to get humans to LEO and geosynchronous orbit (GEO).

But how to really get humans into space? Some people want to go to Mars. It may strike the imagination now, but in the long run I think Mars will be a disappointment. Too small to terraform and inhabit, too big to use as a platform for further space exploration. In fact, I think humans will do best in gravitats–‘wheels in space’–in the long run. The minimum-size gravitat which does not produce a spin-sensation in the average human is one kilometer across, so it is not small. But once built, gravitats can be used in many locations: as stations at Lagrange points, as bases on low-gravity bodies like the moon, and as slow interplanetary vehicles.

Furthermore, we can built most of a gravitat on the moon, as well as many other handy items like monocrystalline silica wafers for semiconductors and efficient photovoltaic cells. Once we build a mass-driver on the moon, we can also lob products off the surface and either glide them down to earth or nudge them out to other orbits or other planets.

The problem is imagining the transition ‘from A to B’: from our present general indifference to space, to having a viable, productive lunar base that manufactures reflectors for massive far-side optical telescopes; wire and bars for structures and machines; and liquid hydrogen and oxygen for propellants.

The following pages are thought-pieces on issues and designs necessary to make that step.

B. First bits

The main challenge in developing a major lunar base is thinking phase-wise about scaling up. The first bits of equipment will need to be manufactured on earth, lifted all the way to the moon, and landed under controlled power. The equipment should be chosen to enable ‘bootstrapping’ up to larger and larger capacities.

These are guesses. But it seems like the earth-made equipment needed to begin the base are:
A pressurized habitat which can be buried under lunar soil.
A small tele-operated robot which can be used in lieu of human space-suited exterior activities (HEAs).
A large tractor which can operate as an earthmover. Call it a crawler.
A strong photovoltaic array.
Big mirrors which can focus enough sunlight to vaporize lunar soil.
Some refining equipment (will have to read up on what is needed here to start with).

C. Second step: bulk refining, basic manufacturing

The lunar base needs, first of all, to develop the capacity to refine and mold metals (aluminum, titanium, and iron) and crystals (mostly silica), and extract and contain gases (oxygen, hydrogen, and whatever else is available).

D. Third step: machining and assembly

In this third phase, the base will need to:

  • form basic metal stock into machined members for structures,
  • weave wire into cable and fabric, and
  • build large, simple machines.

Among the large machines will be bigger crawlers used for paving, mining, and moving items; compulsators and mass-driver components; electric distribution network components; and the parts for gravitats.

E. Beyond the bootstrap phase

After this point, the critical projects become multiple, parallel, and overlapping. The electrical system and mass-driver are highest priority, but at the same time components need to be built and stockpiled so they can be lobbed as soon as the mass-driver is completed. Likewise the gravitat needs to be built, so that longer-term experimentation in closed-loop life-support can begin. Paving the area around the base will be a slow process, and once the mass-driver is online, the same team and equipment will proceed to lay more mag-lev track to other locations around the moon. At this point the purposes and processes of the lunar base will be too complex to predict at the moment. What get learned from ‘bootstrapping’ the base into operation will probably open many possibilities.

One likely ongoing project will be astronomy, particularly in the electromagnetic bands ranging from visible light out to radio waves. All of these require larger collection mechanisms, either reflectors or conductive arrays. The far side of the moon is an excellent location for these telescopes.

The second ongoing project will be as a major factory, building robots, satellites, deep-space probes, and gravitats. As more mag-lev tracks are built in various directions, payloads can be launched in various directions, including straight out from the far side of the moon. This will facilitate not just a Mars mission, but also roving gravitats which can support extremely complex, long-term exploration.

F. Location

I agree with the various authors who recommend that the first Luna base should be located at one of the poles, where sunlight is always available. With the information available in 2005, I think the south pole is a slightly better choice. In part because the astronomy of the southern hemisphere is very interesting; in part because there is a crater right at the south pole (Shackleton) which may be very useful.

Colonizing Luna: Overview

Next Steps in Using Near-Earth Space and Luna

First written: August 3, 2005

This is the fist in a set of conceptual essays to design a permanent, self-supporting, productive Lunar base.

As I thought it through, I have been realizing that the whole zone from low-earth orbit (LEO) out past the moon is crucial to future human deep-space exploration.

PROBLEMS

Most of the description here is of a substantially-developed base, and so the obvious first problem is getting from here to there. This problem can be broken into four parts:

1. Cost, mainly in the form of political acceptability. This is an issue which NASA deals with constantly, so I have little to contribute except in the specific proposals and promise of this base.

2. Environmental impact. Mainly this is the atmospheric damage caused by rocket launches. Part of this is atmospheric disruption, part of it is the chemicals used as propellants. LOX and kerosene are better than the solid propellant used on the shuttle boosters, but we need to carefully study how to minimize atmospheric harm from rocket launches.

3. Scaling-up, or ‘bootstrapping.’ This is the main challenge for a permanent Lunar base. To become self-supporting I think it will require very substantial facilities for mining, refining, manufacturing, and return-to-earth systems. As quickly as possible, ‘bulky’ items should be produced on Luna.

Scaling-up should be the driving principle in designing the interim stages to get us to a permanent Lunar base. Systems should be designed for multiple use and re-use, and maximum-value items should be pursued first, to subsidize the development of ‘beach-head infrastructure’ in the early stages, where the greatest uncertainties exist. Examples:

a. chemicals, medicines, and crystals which can only be grown in microgravity.
b. permanent storage of highly-radioactive nuclear waste.

4. Surprises and unknowns. This should also be regarded as an opportunity; as we face unknowns we learn. The challenge then is how much a taxpaying public is willing to underwrite the financial risks of fundamental research. This will depend upon political persuasion. It could, in time, become a major rationale for the U.S. government itself. Since the FDR administration, we have rationalized massive government investment through the ‘war-mobilization’ model. If, instead, we used government resources in an ‘exploration-mobilization’ model, we would continue to develop both technology and economic growth which will justify the effort and very likely maintain U.S. military supremacy without the belligerence.