The Limits of Space Colonization

I don’t believe that O’Neill wasn’t trying to create plans that were as detailed as much as possible when he was imagining the cylinder. It seems that he only wanted to sketch out the main ideas to get some discussion and thinking going. I base this conclusion on how he said that his proposals to mine materials from the Moon instead of the Earth were only intended to be “proofs of existence”, how he didn’t specify everything about how to build the cylinders, etc.

The dimensions and material design of the O’Neill Cylinder featured in Futurist Fantasies were based on the original O’Neill Cylinder concept, as stated on Wikipedia. The original O’Neill Cylinder design also used conventional design materials. Most spacecraft use aluminum, iron, or titanium. Nowadays, most futurists imagine spacecraft that is intended for interplanetary colonization to be made out of materials that are extremely expensive to create. It also hasn’t been demonstrated whether or not it’s viable to build such large structures.

Additionally, the Futurist Fantasies O’Neill Cylinder had an imagined length that was reduced to 10 kilometers long, in order to make it physically possible to build the cylinder with steel. Van Allen calculated how much it would cost just to send one cylinder into Low Earth orbit:

• The Square/Cube Law makes it very difficult to build advanced megastructures like space elevators, orbital rings, etc.
• 12km is the maximum length that a steel cable can support its own mass at Earth surface gravity. If it is any longer, it will snap under its own weight.
• O’Neill Cylinders will probably never be economically feasible to build. If we built an O’Neill Cylinder that’s 10km long and 6.4 km in diameter, with a 1m thick hull, then it would weigh 3 trillion kg (2 trillion kg of steel, with 1 trillion kg of material).
• Putting 1 kg into LEO varies between $50,000 and $1,500. The lowest cost being the Falcon Heavy from SpaceX, but with only 3 completed launches, this is a somewhat optimistic estimate.
• So, if we assume a cost of $1000/kg, then putting a 3 trillion kg cylinder into LEO would cost $3 quadrillion ($3,000,000,000,000,000), and that’s only for one cylinder.
• For comparison, the world’s nominal GDP is less than 100 trillion dollars.

– Paraphrased/Summarized from Futurist Fantasies by T. K. Van Allen

If it really would cost an estimated $3 quadrillion to build and launch such a megastructure into LEO, then it’s clearly not feasible. The Futurist Fantasies O’Neill Cylinder also isn’t optimal for interplanetary travel. The cylinder is too long and wide, and the hull isn’t thick enough for radiation shielding or protection against potential micrometeorite impacts. If we consider more optimal dimensions, then the cylinder will become more likely to achieve its goals, as well as more economical to build.

I would like to state some reasonable premises for these thought experiments:

• I want O’Neill Cylinder designs that are optimal and likely to accomplish their intended goals.
• I want O’Neill Cylinder designs that are likely to withstand interplanetary space travel.
• I want to estimate how much it would cost to send such a Cylinder to Mars, or Martian orbit.
• I am only interested in constructing spacecraft that are economically and physically possible to build.
• I’m not interested in technologies that don’t exist, or hypothetical cost reductions that haven’t happened yet. We cannot assume that we can rely on such hypothetical and unseen progress. There are no guarantees that such progress will actually happen, unless it’s provably likely to occur. Unless it’s provably likely that such progress will actually happen, there are no guarantees that it will occur.
• I want to know what could potentially go wrong with O’Neill Cylinders. Spacecraft have been accidentally destroyed in the past, so this is definitely worthy of consideration.

Since I want detailed and informed answers to all these questions, this page features questions and answers from the Claude 3.5 Haiku Explanatory LLM. The questions and answers are included on this page, with the only edits being removals of unrelated information, changes to formatting, and some light commentary on a few answers.

Before we ask Claude questions about O’Neill cylinders in the next section, we should establish why it makes sense to make the O’Neill cylinders as small as possible:

• It will obviously take a lot of resources to build even a single O’Neill Cylinder.
• Smaller structures are more feasible to build. Humans still haven’t managed to build buildings that are taller than a kilometer.
• Smaller structures will require less energy to launch.
• As mentioned before, the spacehook seems like one of the most promising space launching infrastructure ideas out there.
  • In order to make spacehooks more viable, a constant stream of spacecraft flying between Earth and Mars would be necessary, in order to balance out the gravitational pulls for each spacecraft.
  • Humanity will have more spacecraft to accomplish this, if the spacecraft are each built smaller.
• Smaller structures will be easier to mass produce. Hypothetically, a galactic space colonization will be much easier if all spacecraft use similar sizes and interchangeable parts.
• Smaller structures minimize the potential losses and costs of failure.
• The event that a rather small O’Neill cylinder accidentally falls towards the Earth is already dangerous enough as it is. If the same event happened with a cylinder that was the same size as the original design proposal, the impact would be strong enough to cause a mass extinction event that would probably wipe out most of the life on Earth.

Hypothetically, if the space infrastructure, space travel, and colonization all works out, then these life-sustaining spacecraft could be reused to colonize other planets, even after they finish their first journey(s).

The only conceivable advantage that bigger spacecraft may have is that they could sustain more people and resources. This could make the initial colonization of a planetary body easier, if the spacecraft successfully manages to land on the planet with all the life on it still living. However, larger cylinders simply aren’t very realistic. Smaller structures are more practical by every other measure. We will thus choose the smallest cylinder from the design proposals mentioned in the next section.

What dimensions for optimal O’Neil Cylinders have been proposed to send to Mars?

Based on various academic and space exploration research proposals, there are several noteworthy dimensional concepts for O’Neill Cylinders targeted at Mars missions:

1. Stanford Space Settlement Design Study (Most Comprehensive Proposal)
   • Diameter: 500-1,800 meters
   • Length: 4-8 kilometers
   • Rotation Speed: 1-2 RPM
   • Estimated Population: 10,000-100,000 inhabitants
   • Artificial Gravity: Precisely 1g at cylinder’s inner surface
2. NASA Advanced Concepts Studies
   • Diameter: 300-600 meters
   • Length: 2-5 kilometers
   • Rotation Speed: 2-3 RPM
   • Estimated Population: 500-5,000 people
   • Artificial Gravity: 0.8-1.0g
3. Gerard O’Neill’s Original Conceptual Designs
   • Diameter: 500-1,000 meters
   • Length: 3-6 kilometers
   • Focused on creating self-sustaining environments
4. Mars Direct Mission Proposals
   • Smaller, More Compact Designs
   • Diameter: 150-250 meters
   • Length: 1-2 kilometers
   • Rotation Speed: 4-5 RPM
   • Estimated Population: 100-250 people

Key Design Considerations:

• Minimizing motion sickness
• Structural integrity
• Radiation shielding
• Resource efficiency
• Psychological livability

Let’s break down the material composition and weight of a hypothetical Mars Direct Mission O’Neill Cylinder using conventional materials.

Let’s break down the cost estimation for our Mars Direct Mission O’Neill Cylinder in a comprehensive, step-by-step analysis.

Cost Breakdown Components:

1. Raw Material Costs Given our previous weight estimate of 98,000-129,000 metric tons, material pricing would be substantial:
   • Titanium: $20-30 per kilogram
   • High-grade Aerospace Aluminum: $15-25 per kilogram
   • Specialized Steel Alloys: $10-20 per kilogram
   • Total Raw Material Cost Estimate:
     • Low-end: $3-4 billion
     • High-end: $6-8 billion
2. Manufacturing and Fabrication
   • Advanced aerospace manufacturing adds significant complexity
   • Precision engineering for rotating habitat
   • Specialized manufacturing facilities
   • Estimated manufacturing overhead: 200-300% of raw material costs
   • Manufacturing Cost Estimate:
     • Low-end: $9-12 billion
     • High-end: $18-24 billion
3. Space Launch and Assembly Costs
   • Heavy-lift rocket launches (SpaceX Starship or similar)
   • Current launch costs: $2,000-$5,000 per kilogram to orbit
   • Total launch mass: 129,000 metric tons
   • Launch Cost Estimate:
     • Low-end: $258 billion
     • High-end: $645 billion
4. Design, Research, and Development
   • Cutting-edge space habitat engineering
   • Interdisciplinary research teams
   • Prototype development and testing
   • R&D Cost Estimate: $10-20 billion
5. Additional Systems Integration
   • Life support technologies
   • Radiation shielding
   • Ecological systems
   • Power generation
   • Communication infrastructure
   • Systems Integration Cost: $15-30 billion

Total Estimated Cost Range:

• Conservative Estimate: $295 billion
• Ambitious Estimate: $723 billion

---

Commentary
We should keep in mind that the estimated $295-793 billion is potentially a huge under-estimate, since the weight calculations didn’t correctly account for the thickness of the cylinder hull.

However, retrieving most of the materials for the cylinder from the Moon instead of the Earth could make it much cheaper to build:

To reduce the mass needed from Earth, most of the repetitive structural members (aluminum) and window panels (glass) must be produced at L5 from lunar material. A further, important saving is made by getting 89% of the mass of needed water from oxygen in the plentiful lunar-surface oxides, bringing only 11% of the water mass as liquid hydrogen from Earth. Of the 500,000-ton total mass (see Table 2) for the Model 1 colony, 98% can be obtained from the Moon. The elements most needed are aluminum, titanium, silicon and oxygen. Lunar surface soil is usable for agriculture, with the addition of nitrates and small amounts of trace elements. The remaining 10000 tons must come from the Earth.

To bring the total cost within practical limits, we must develop a low-cost method for transporting raw materials from the Moon to the construction site. The discussion of transport methods should be taken as an existence proof rather than as a detailed design. There may very well be better methods than those I have considered; however, it is enough to show two solutions that appear to be workable. Both use the two great advantages of the lunar environment: an excellent vacuum and a very low escape velocity, about 1.5 miles per sec, less than one quarter of the escape velocity from Earth. To bring a kilogram to L5 from the Moon takes less than 5% of the energy needed to take a kilogram from Earth.

– Gerard K. O’Neill, Physics Today, 1974

Even then, two cylinders would have to be built to fulfill the original design proposal, and it would still be expensive to build pairs of cylinders and the necessary infrastructure for building them.

How much would it cost to launch that O’Neill Cylinder from Earth to Mars, when accounting for the Tsiolkovsky rocket equation? Assume that humanity is dependent on currently existing rocket-launch technology. Please provide an equation for all these calculations.

I’ll break down the launch cost calculation using the Tsiolkovsky rocket equation, providing a comprehensive analysis of the launch economics for our Mars Direct Mission O’Neill Cylinder.

Tsiolkovsky Rocket Equation Fundamentals:

Δv = ve * ln(m0 / mf)

Where:

• Δv = Change in velocity
• ve = Exhaust velocity
• m0 = Initial total mass
• mf = Final mass after propellant consumption

---

Launch Parameters:

• Total Cylinder Mass: 129,000 metric tons (129,000,000 kg)
• Current Best Rocket Technology: SpaceX Starship
  • Exhaust Velocity (ve): Approximately 3,500 m/s
  • Propellant Mass Fraction: ~0.92

---

Detailed Calculation:

1. Initial Mass Calculation: m0 = Cylinder Mass + Propellant Mass
   m0 = 129,000,000 kg + (129,000,000 kg * 0.92)
   m0 = 129,000,000 kg + 118,680,000 kg
   m0 = 247,680,000 kg
2. Final Mass Calculation: mf = Cylinder Mass
   mf = 129,000,000 kg
3. Velocity Change Calculation: Δv = 3,500 m/s * ln(247,680,000 / 129,000,000)
   Δv = 3,500 m/s * ln(1.92)
   Δv = 3,500 m/s * 0.653
   Δv ≈ 2,285 m/s

---

Energy and Propellant Requirements:

• Liquid Methane/Liquid Oxygen propellant
• Total propellant mass: ~118,680,000 kg
• Equivalent to filling about 47,500 Olympic-sized swimming pools with rocket fuel
• An Olympic-sized swimming pool contains ~2,500,000 liters or 660,430 gallons of water.

---

Commentary
TL;DR: The rocket equation guarantees that it will be impossible to ever launch enough propellant fuel into space, for getting a life-sustaining human colonization spacecraft from Earth to its destination.

The next section will ask about some things that could potentially happen if O’Neill Cylinders were orbiting the Earth. We obviously don’t want catastrophic scenarios to happen, but we must be willing to consider them, when preparing ourselves for the future. Car accidents happen, train accidents happen, plane accidents happen, and spacecraft accidents have happened.

For the future, the question isn’t if space colonization related accidents will occur. The question is when will they occur, assuming that space colonization is physically and economically feasible in the first place.

Let me break down the potential scenarios that could cause an O’Neill Cylinder in Low Earth Orbit (LEO) to descend towards Earth’s surface, exploring this from multiple scientific perspectives.

Primary Descent Mechanisms:

1. Orbital Decay Due to Atmospheric Drag
   • Even in LEO, extremely thin atmospheric particles create gradual resistance
   • Over time, this constant friction reduces orbital velocity
   • Causes progressive lowering of orbital altitude
   • For a large structure like an O’Neill Cylinder, drag effects would be significantly amplified due to massive surface area
2. Structural Integrity Failure
   • Micrometeorite impacts
   • Extreme temperature fluctuations causing metal fatigue
   • Radiation-induced material degradation
   • Potential structural breach leading to asymmetric mass distribution
   • Disruption of rotation could cause destabilization
3. Propulsion/Stabilization System Failures
   • Attitude control thrusters malfunctioning
   • Gyroscopic stabilization systems failing
   • Loss of ability to maintain precise rotational velocity
   • Could induce uncontrolled descent trajectory
4. Gravitational Perturbations
   • Interactions with Earth’s non-uniform gravitational field
   • Lunar gravitational influences
   • Solar wind and electromagnetic interactions
   • Cumulative effects could gradually alter orbital parameters
5. Human-Induced Scenarios
   • Deliberate deorbiting
   • Catastrophic system failure
   • Planned end-of-life disposal protocol

---

To maintain stable LEO, the cylinder would require:

• Continuous micro-adjustments
• Advanced materials resistant to space environment
• Redundant stabilization systems
• Precise mass distribution
• Regular maintenance and monitoring

Potential Mitigation Technologies:

• Ion propulsion systems
• Electromagnetic orbital maintenance
• Adaptive structural materials
• Predictive computational modeling

What could happen if the Mars Direct Mission Proposal O’Neill Cylinder mentioned earlier was in LEO and fell towards the Earth’s surface?

Catastrophic Impact Scenario Analysis for 129,000-Metric-Ton O’Neill Cylinder

Kinetic Impact Energy Calculation:

• Total Mass: 129,000,000 kg
• Potential Orbital Velocity: ~7.8 km/s (LEO standard)
• Kinetic Energy: 1/2 * m * v²
• Calculated Impact Energy: Approximately 3.92 x 10¹⁵ joules

Comparative Destruction Metrics:

• Equivalent to: 936 Hiroshima atomic bombs
• Total Destruction Radius: 400-600 kilometers
• Potential Ground Zero Crater: 15-25 kilometers wide
• Estimated Immediate Fatalities: 3-5 million people
• Secondary Impact Effects: Potential global climate disruption

---

Atmospheric Disintegration Phases:

1. Initial Atmospheric Entry
   • Massive structural fragmentation
   • Superheat generation (10,000-15,000°C surface temperatures)
   • Creation of multiple large debris trajectories
2. Fragmentation Impact Zones
   • 3-7 major structural segments
   • Widespread ground impact zones
   • Potential multiple crater formations
3. Environmental Consequences
   • Dust and debris cloud blocking sunlight
   • Potential short-term global temperature reduction
   • Massive ecological disruption
   • Potential agricultural collapse in multiple continents

---

Psychological and Societal Implications:

• Unprecedented technological disaster
• Potential complete collapse of public space exploration support
• Major geopolitical destabilization
• Potential long-term human civilization disruption

---

Commentary
As we can see, humanity should be extremely cautious about building any structure that is as large as a compact O’Neil cylinder, especially if the structure is intended to be sent into space. A single mistake or accident could potentially cause unprecedented destruction and devastation to the entire planet.

Musk’s SpaceX company is largely a fraud. SpaceX is highly unlikely to achieve its stated goals by the end of the century, as explained on this page. Space colonization is unlikely to be successful, and it’d probably take 150-200 years for it to succeed, if ever. Besides Starlink and launching satellites at more economical prices, pretty much everything else that SpaceX does or has ever done has been a waste of resources. It would be more practical for humanity to focus on colonizing Antarctica instead.

This isn’t a minority opinion either. Sabbine Hossenfelder has reached similar conclusions about Mars colonization. Musk has a bachelor’s in physics. He should know better about these things. Anybody with decent intelligence could do the math and understand space colonization isn’t going to be happening in any of our lifetimes.

Musk has consistently overstated the expected accomplishments of Tesla company. Tesla has repeatedly failed to accomplish what he said would be accomplished within specified time frames.

Musk also founded the Boring Company to kill High Speed Rail, thus holding back American energy independence, sustainable infrastructure, lower pollution, etc. The goal of preventing High Speed Rail adoption was just so that he could make money selling cars. He’s admitted to this and he’s largely succeeded at it. Musk has stalled humanity’s progress in favor of his own success. He has announced plans to build high-speed rail as Hyperloop, but nothing has come out of these proposals. It was most likely just babbling to get attention.

Cars in general are one of the worst inventions ever created in human history. For someone who claims to be invested in solving humanity’s greatest challenges, he’s not helping by playing along with the system. For humanity to move forward, we need to largely get rid of cars, not renovate them. Cars are a waste of the Earth’s scarce resources, and he’s not helping to conserve resources by manufacturing more cars and perpetuating the further usage of cars. Tesla Inc also doesn’t support the right to repair.

For someone who claims to care about climate change, he has one of the largest carbon footprints in the entire world, and he’s not even doing much good with what he’s doing.

Neuralink is one company that he’s founded that could have some real potential, but I estimate that it will probably take decades. Even if Neuralink succeeds at its goals, that would probably do some good for humanity and scientific/technological progress. But it probably won’t be much progress, since humans are already able to interact with AI to a great degree. Enabling people to live longer also exacerbates overpopulation.

OpenAI and xAI have the potential to do good for this world, but not much. AI has the potential to be abused just as much as it’s used to do good. AGI is still long ways away, and it seems unlikely to surpass human intelligence, both economically and in potential, due to the tremendous energy and computing requirements.

Twitter has marginally improved since Musk bought the company. However, people have to pay money in order for their voices to be heard, so Musk has failed to ensure real free speech. He also arbitrarily censors people on the platform, especially when they criticize him. Currently, Substack is the best platform for free speech. Humanity isn’t going to save itself or move forward without true free speech, so this is a huge deal.

The leadership style of all his companies is terrible. I’ll grant that many CEOs also have leadership flaws. Even though, he would do better to have a more similar leadership style to Steve Jobs. Does Elon Musk sound like a guy that you’d want to work for, based on what former employees have testified? Almost certainly not.

I am glad that Musk helped Donald Trump win the 2024 US Presidential election. I’m glad that he’s applying pressure on Trump to deport illegal aliens from the United States. However, I dislike Musk’s outspoken support for H-1B visas. It’s largely abused as a supply of cheap foreign labor. Expanding the use of H-1B visas is against the best interests of everyday Americans, and it could have dysgenic effects on the population. It’s laughable how Musk created an alt account to defend himself on Twitter. It shows how fragile and mentally unstable his ego is.

Other Political Commentary About Elon Musk:

• Musk’s promotion of cryptocurrencies is also a joke, since it promotes irrationality.
• Musk’s support for consumption tax and UBI are bad for society.
• Musk has never advocated in favor of eugenic population control, which humanity needs in order to have a decent, sustainable future.
• I am glad that Musk opposed the unnecessary COVID-19 lockdowns.

In general, Musk’s politics wouldn’t fix most of the world’s problems. Many of his policies are also meant to benefit himself at the expense of everyone else. For example, his support H-1B visas would give his companies an abundant supply of cheap labor, at the expense of lowering the wages of American workers.

Musk supports consumption tax because that’s the tax that would hurt him the least, not because it’s the best for society. He doesn’t propose income taxes because that would obviously hurt his companies. He hasn’t spoken in favor of property or land value taxes, because that would tax all the land and properties used for his companies. And since most of his main companies (SpaceX, Tesla, Boring Company) are funded by the government or subsidies, they wouldn’t have to pay much value-added tax. Tesla gets tax breaks and subsidies, since the government wants to create an image of promoting green energy.

So far, most of Musk’s actions haven’t positively changed most people’s lives, and certainly not more than some more notable (living) people (e.g. Blithering Genius, Veritasium, Tim Berners Lee, Shuji Nakamura, Jeff Bezos, Bill Gates, etc; Kary Mullis, Fritz Haber, Steve Jobs, etc). Musk hasn’t made any comparable net positive impact on the world, nor has he contributed more than the exemplary people mentioned. If he never existed, humanity and the Earth’s condition would be largely the same as it already is, and arguably even better.

Elon Musk largely hasn’t done anything to make our lives better (although deporting illegal immigrants from the US would his greatest accomplishment), he has no original ideas, he’s one of the most narcissistic people on the planet, he’s not a nice person, most of his business endeavors are futile, and he’s largely a fraud who appeals to people’s unrealistic imaginations. Elon Musk is the most overrated person on Earth.