SpaceX Mars City: Here’s How Much Elon Musk's Dream Would Cost

Elon Musk has placed a figure on the scheme that's out-of-this-world.

A Mars city.

How much would it cost to build a city on Mars? According to Elon Musk over the weekend, it could be the most expensive construction project in human history — and cost up to an eighth of the value of the entire global economy.

The SpaceX CEO’s vision includes not only sending the first humans to Mars, but to use that mission as a starting point to build a permanent settlement. Assuming all goes to plan, Musk believes that a self-sustaining city could take shape as early as 2050.

What happens after that point is anyone’s guess. Inverse has spoken to experts from a number of fields, who have flagged a series of issues those first inhabitants will need to address. They could mutate and develop new physical attributes, they could find the city’s confines stifling and develop a national identity, and they could develop a new, ground-up economy.

Musk has previously suggested SpaceX could offer a return ticket to Mars at around the same price point as the median house in the United States. That would run to around $200,000, with the logic that someone could sell their house and move to Mars.

This video includes Musk's comments during his 2018 South by Southwest appearance.

Guenter Lang, an economics professor at Kühne Logistics University in Germany, told Inverse in May that the trip would still likely seem a wild adventure to many rather than a serious investment, meaning it could skew toward the richer.

So if SpaceX is looking to start a new city in just three decades, how much would it cost?

“Between $100B and $10T,” Musk declared via Twitter on August 10.

How much would it cost to have a city on Mars? Here's Elon's math he shared with a follower on Twitter this past weekend.
How much would it cost to have a city on Mars? Here's Elon's math he shared with a follower on Twitter this past weekend.

SpaceX Mars City: The Price to Build a New Mars City

Musk has pegged the ultimate price of establishing this city at somewhere between $100 billion and $10 trillion.

The calculations are based on the assumption that a city would require one million tons of cargo from Earth to function at a minimum. Musk said as much during a July 2019 interview with CBS News, comparing the scale of the challenge with that of the lunar lander that didn’t have to carry so much. On Saturday, he clarified that this was to the nearest order of magnitude.

The new Starship images.
SpaceX's Starship, as envisioned for a Mars settlement.

The cost of setting up this city would depend on how much it costs to send each ton to Mars. If it’s $100,000 to send each ton, Musk explained Saturday, that would set the price at around $100 billion. Musk estimated in 2017 that the current price is around $140,000 per ton, but cited the $100,000 figure as feasible.

Musk’s figures leave a broad section open. Here’s what $100 billion could also cover:

  • The net worth of any single person in the world, except for Benard Arnaut, Bill Gates and Jeff Bezos. It could cover Musk’s own $22.8 billion net worth nearly five times over.
  • Around half of New Zealand’s annual gross domestic product at $204 billion.
  • Marianne Williamson, who’s aiming for the Democratic nomination in the American presidential election, called for $100 billion in reparations for slavery.
  • The Paris Agreement committed countries to a combined spend of $100 billion per year on fighting climate change.
  • The money could also pay for 1,500 SpaceX Falcon 9 rocket launches, at $62 million each.

$100 billion is also enough to meet Doctor Evil’s ransom demands in Austin Powers:

SpaceX Mars

What about $10 trillion, the upper bound of Musk’s figure?

  • That would outrank the nearly $500 billion cost of the American Interstate Highway system, arguably the most expensive construction project in human history.
  • It’s enough to cover the $1.4 trillion land value of New York City around seven times over.
  • It’s almost enough to buy all the assets in the United Kingdom, valued at around $11.8 trillion.
  • It’s around double the total sum of physical money that exists in the world.
  • It’s also around half of the United States’ annual gross domestic product at $19.5 trillion, and double that of Japan’s at $4.9 trillion. In fact, it’s around one-eighth of the total global economy with every annual gross domestic product added together, estimated at around $79.98 trillion.
  • It’s enough to buy the world’s 10 highest-valued public companies and have around $3.6 trillion to spare.

It sounds like an unbelievable amount of money, but it’s still a fraction of global wealth. Real estate is estimated to be worth around $217 trillion total, around the same amount as global debt for individuals and nations combined. Wealth invested in derivatives is somewhere between $544 trillion and a staggering $1.2 quadrillion.

Nonetheless, in terms of the cost of building a new city, it’s an absolutely astronomical figure.

Elon Musk detailing moon mission
Elon Musk, speaking at a September 2018 event where he detailed plans to fly a Japanese billionaire around the moon.

SpaceX Mars City: How to Build a City

SpaceX is expected to use the Starship to kickstart its city. This is a 348-foot stainless steel rocket, fully reusable, with enough pressurized cabin space to comfortably hold around 100 people on a trip to Mars lasting three to six months. It’s designed to take over 100 tons of payload as far as Mars, assuming SpaceX can solve the issue of adding more fuel in orbit.

The company unveiled its plan to send humans to Mars in September 2017, explaining how two unmanned Starships would first land, then around two years later when the Earth and Mars are close again, the firm would send two manned and two unmanned ships.

These people would be tasked with setting up a propellant depot, refueling the ship with liquid oxygen and methane to return home. Musk plans to update the public on this project on August 24.

Over the course of 10 orbital synchronizations, flying when the Earth and Mars are closest, Musk claims it is possible to establish a city. To reach the 2050 deadline, Musk stated, the team would probably have to start by around 2024. Principal Mars development engineer for SpaceX Paul Wooster explained in September 2018 that the future inhabitants would have to expand beyond the propellant depot to create recycling schemes, landing pads, habitats, greenhouses and further life support schemes.

SpaceX's BFR landing on Mars.
SpaceX's BFR, an earlier version of the Starship, landing on Mars.

SpaceX Mars City: Why Musk Wants to Do It

It’s going to be ridiculously expensive, it’s not going to be fun for the early inhabitants, and there’s a chance the whole thing fails and collapses into an overpriced disaster. So, why is Musk doing it?

In short, because he sees it as a reason to look forward to the future. At a September 2018 event, he explained:

“There’s so many things that make people sad or depressed about the future, but I think becoming a space-faring civilization is one of those things that makes you excited about the future…that is the intent of BFR [now known as Starship], is to make people excited about the future.”

The most expensive project of all time? It could break humanity free from the confines of Earth and spark a new era in its history.