“Artemis” by Andy Weir — Blame it on the Moon

It is the very error of the moon; She comes more nearer earth than she was wont, And makes men mad.
William Shakespeare – Othello

Book cover - Artemis (2017)
Book cover for Artemis (2017) by Andy Weir

This post is about the recent book Artemis (2017) by Andy Weir which is a novel set on the first permanent Moon station. called “Artemis”. I was looking forward to reading Artemis because I had enjoyed reading his book The Martian. I loved his unorthodox writing style in that book, which fitted in so well with the unfolding of the timeline of the story.

I loved the movie The Martian (2015), directed by Ridley Scott, made from that book. Matt Damon was brilliantly cast as the interplanetary castaway Mark Watney. I loved that it was sci-fi for the near-future. It was tantalising because, with the book and movie, I could easily visualise the colonisation of Mars unfolding along similar lines. It was just so scientifically grounded and believable.

When I started reading Artemis the thought that it was an inspired idea that an African country such as Kenya could take advantage of the technology of moon colonisation to boost their economy to the first-world standard. It was such an optimistic and hopeful view of a world that might be. I loved the idea that the protagonist was an anti-heroine, Jasmine “Jazz” Bashara from Saudi Arabia. That also seemed, at least at first, to be inspired. But later, when she transforms from a small-time smuggler to a big-time crime-boss, still with her smart, way-too-cool sassiness, the characterisation of Jazz losses its credibility and her role just becomes plain silly. Indeed, the whole story, after being so promising, loses its way and degenerates to silliness as I’ll explain.


The colonisation of the Moon

Warning spoilers from this point. Because a large part of the cost of items on Artemis is transportation from earth, the unofficial currency is the SLG for a “soft landed gram” called a slug, denoted as ğ. One slug is one gram of cargo transported by the Kenyan Space Corporation (KSC). Who knew that, owing to the high costs of transportation, that there would be a market in recycled condoms on a moon city?

Weir has a lot of fun with how the laws of physics work on the moon. Turns out there’s a good reason for all those recycled condoms because all the new possibilities for sex in low-gravity is a major tourist attraction for Artemis. Perhaps, even rivalling the attraction of the Apollo 11 visitor centre where Armstrong took his first steps on the lunar surface.

Jazz lives in the poorest parts of Artemis, she’s the estranged daughter of her father, who is a welder, and is herself a porter for delivery of goods. This earns her enough slugs live in a “slab” which is a space only big enough to sleep in and she shares a toilet and shower, down the hallway with others in the same meagre accommodations. She often eats “gunk” which is food source produced in algal vats. Because of her circumstances, she earns extra slugs from smuggling items such as cigars to wealthy businessmen. This way she hopes to save her slugs and provide herself with a better future.

Cigars are strictly forbidden on the moon colony because Artemis has followed the life-support practices of the old Apollo missions by having an atmosphere of pure oxygen at ⅓ rd earth atmosphere (sea level). This avoids the need to transport nitrogen gas cylinders from earth. The pure oxygen atmosphere means that naked flames of any kind are strictly forbidden because any kind of fire would quickly spread throughout the whole city complex.

For this reason, most lunar accommodations are devoid of kitchen facilities. Cooking is performed in special facilities with their own life-support systems that are isolated from the rest of Artemis. Some rather seedy, but wealthy businessmen, can afford to have an accommodation with separate life support systems – so that they can smoke cigars whenever the need arises. Her smuggling activities bring Jazz into contact with such people.

A Promising Premise

When Artemis was first built by the KSC there was the need for aluminium for construction and to provide a combustant for solid-fuel rocket engines. So the KSC signed a perpetual agreement with the Sanchez smelter corporation for aluminium production using the mineral anorthite which is plentiful on the lunar surface. In this agreement, Artemis would provide Sanchez with electricity at no cost from their two nuclear power plants which produce excess electricity to the needs of Artemis itself.

In return, this agreement stated that Sanchez would provide Artemis with oxygen at no cost in exchange for the electricity. The oxygen was a by-product aluminium smelting and was piped directly from the Sanchez facility to Artemis. Another by-product of smelting anorthite is silica, which was used by Queensland Glass Manufacturing company to produce the glass required for the construction of Artemis.

These arrangements were essential in the early days of building Artemis but as Artemis has grown they’re out-lived their economic necessity. This means that Artemis desperately needs a new export-based income stream on which to base its economy. It’s at this point the cigar-loving business associate of Jazz, with plans for the mysterious substance known as “ZAFO” [1], comes into the picture.

But there’s a really big problem to overcome first. The uneconomic Sanchez operation has become a front for the South American mafia through which to launder large amounts of ill-gotten funds, free from the attention of authorities on earth. This is where small-time smuggler Jazz Bashara finds herself right in the middle of everything; hunted by both the Artemisian security, as well as a hitman, working for the South American mobsters.

Failing Flat (on the Moon)

It’s at this point, in order to stop the flow of oxygen and invalidate the contract between Artemis and Sanchez, that the all-so-promising premise of the Artemis novel comes crashing down in a heap. You see, Jazz, and her co-conspirators, plot to cause an explosion in the Sanchez plant, In order to get the employees to clear out first, she releases chlorine gas from a cylinder that she has brought with her.

The chlorine sets off the alarms, that warn the employees to clear out, as she expects (all excepting the owner, Loretta Sanchez). But she hadn’t accounted for a cylinder of methane that happens to be standing idly by, and in the explosion that follows, they accidentally produce chloroform which, as everyone knows is a knock-out gas, anestheses the entire population of the moon colony into unconsciousness.

Everyone excepting for Jazz, Loretta and her other associates, who are wearing breathing tanks. Jazz takes this opportunity to escape and switch the supply of oxygen for Artemis to oxygen cylinders that have been stockpiled by her former cigar-loving business associate, now dead by mobster hitman.

It’s a race against time for Jazz and her friends to restore the oxygen supply to revive the anesthetized population before their chloroform exposure becomes lethal.

Oh dear! Oh dear! Andy, why didn’t you call me?

I would have been able to set you straight. Would that it was still possible to run about and grab copies of the printed and e-book Artemis, from Amazon and the other bookstores, take them to the dark side of the moon and hide them all in a deep deep crater.

There are at least 2 very good scientific reasons why none of what’s been proposed above in the Artemis novel could ever work:

  • from medical and toxicological perspectives, the effects of chloroform are not what is described.
  • from a chemical perspective, the required amount of chloroform could never be produced as it is described;

These problems are serious for an author that has based his reputation as a sci-fi writer on his ability to portray detailed and accurate science.

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There’s 7.7 kg of chloroform that could be maximally produced from a one reasonably sized cylinder of chlorine. Not much when you consider that it has to be spread around the whole city complex.

How much volume does the Artemis complex occupy? The maps shown in the front of the book show 5-domes, consisting of Aldrin, Bean, Collins and Sheppard (all 200 m in diameter), radiating like spokes around the central Armstrong dome (100 m in diameter). The Sanchez plant is connected to the Artemis complex via a 1-km oxygen supply pipeline, it also consists of a dome of 25 m in diameter.


Remembering that the volume of a sphere is \frac{4}{3}\pi r^3 and that a dome is half of a sphere, the total volume of the Artemis is around 1.1 million m3. We can now proceed to calculate the airborne concentration:


Skip to here.

The result of the calculation is 7.1 mg/m3, this being the case we would need 2000 cylinders of chlorine to get to a concentration near to the 15,000 mg/m3. In the novel, this is what Loretta Sanchez tells Jazz is the level would be required to induce anesthesia in the good citizens of the moon. From the calculations here, it’s simply impossible to produce enough chloroform to produce the effects described in the book Artemis. with a single cylinder of compressed chlorine — unless you break the law of conservation of matter!

What hasn’t been taken into account in the above equations is that oxygen is also present. In the Artemis novel, Jazz circumvents plant safety measures so that the temperature will reach the melting point of stainless steel at about 1450°C. Thereby destroying the Sanchez plant in an explosion when the stainless steel containment vessel fails.


In the presence of oxygen, at around 1460°C, the chloroform, and any other alkyl chlorides formed, would simply combust to produce carbon dioxide, water vapour and hydrochloric acid (HCl) vapour. In addition, burning chloroform in oxygen will produce significant traces of phosgene gas (see on RHS).

Phosgene is extremely toxic in confined spaces, as little as 3 – 10 mg/m3 would cause death in some of the population if they were exposed for 2 or 3 hours. A point of confusion is that it’s hard to get a mental picture because of the scales involved: chloroform requires macroscopic levels of around 15 g/m3 to cause anesthesia (and possible lethality if this level is sustained for an hour or more). On the other hand, phosgene is far more bioactive (∼1000 times) and its lethal effects can occur at trace levels of 3 – 10 mg/m3 (for exposure of a few hours).

Thus, from the considerations here, it’s more likely that the population would die, or suffer grave injury from phosgene poisoning than undergo mass anestheses.

Final Comments

For a sci-fi writer that has built a reputation on hard and accurate science, Artemis could a backward step for Andy Weir. But life is about learning. He has shown uncommon courage in taking risks to bring hard science to a wider audience. Artemis has a lot going for it and deserves serious attention for the imagination that it shows for what it might be like to live in a city on the moon.

The main problem with the book is in introducing chloroform as a mass knock-out gas for the citizens of the Artemis. This plot device mass anestheses shouldn’t ever be seen again in a sci-fi novel that has any claims to being based in actual science. It’s the kind of impractical science that Jonathon Swift (in Gulliver’s Travels) would have satirically described as “extracting moonbeams from cucumbers.”

Hopefully, this is just an unfortunate aberration from Andy Weir and that with his next book he’ll be back to the same standards he had set with The Martian. Let’s just blame it on the moon this time.

Edit: 19 Jan 2019
Yes, there is an Artemis movie in the works, see at Unbound Worlds.

Edit: 20 Jan 2019
Just got an email from Andy Weir. “Bummer!” he says and adds that the problem is actually worse than I stated because the moon domes are actually full spheres in Artemis (rather than half-spheres as I assumed).


[1] ZAFO stands for “zero attenuation fibre optic” is constructed from a new form of glass core that offers zero transmission loss and can only be constructed economically on the moon. In the novel Artemis, it’s seen as an important export material that will provide future economic stability for the lunar colony.

[2] Acute exposure guideline levels (AEGL) are a way of expressing human health effects from rare exposures to airborne chemicals. AEGL-3 is the airborne concentration (expressed as mg/m3) of a substance above which it is predicted that the general population, including susceptible individuals, could experience life-threatening health effects or death.

[3] Committee on Acute Exposure Guideline Levels; Committee on Toxicology; Board on Environmental Studies and Toxicology; Division on Earth and Life Studies; National Research Council, Acute Exposure Guideline Levels for Selected Airborne Chemicals: Volume 12, Washington (DC): National Academies Press (US). Published: 2012 Apr 27; available online; accessed: 18th November 2018.

[4] Medical Annotations, The Lancet, 86, 2200, p 490-3; 1865.. Available online accessed: 18th November 2018.

[5] Argon is used for welding on earth because it’s plentiful (it can be extracted from liquid air). On the moon, neon is preferable because it weighs about half that of argon for the same amount.

3 Replies to ““Artemis” by Andy Weir — Blame it on the Moon”

  1. I said the same thing about Harry Potter! In all seriousness great post. Sad, this story sounds like it had great potential. Ill still read it and tbh I probably wouldn’t of questioned the anesthesia part of the story… like chemical magic in the futures w/e. BUT good guys setting off large scale explosions after you have already established small tight living spaces – in high oxygen environment. Questionable even to me.

    1. I was genuinely enjoying the book up until about 2/3rds the way through. Then the chloroform knock-out gas plot device really rattled my cage.

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