When the Moon Hits Your Eye by John Scalzi

Published by Tor Books on March 25, 2025
John Scalzi usually displays his sense of humor in his science fiction novels. He’s churned out a bunch of science fiction comedies, the most successful being Redshirts. The stories tend to be amusing and Scalzi typically uses comedy to make a serious point. Even when he writes more serious novels (like Old Man’s War), he adds generous doses of humor. And he always remembers that the word “science” is in “science fiction” for a reason. Well, nearly always.
When the Moon Hits Your Eye is another sf comedy. It has sufficient merit to earn a recommendation, but it’s also disappointing. I had the impression that Scalzi wrote himself into a corner as he milked laughs from his premise and couldn’t come up with a credible way to ground the story in science.
The premise is ridiculous. One day, the moon turns into cheese — or at least into an organic matter that has the characteristics of cheese. Not only does the moon transform, but so do space rocks displayed in museums and kept in NASA’s vaults.
Scalzi brings a fair amount of science to the project, explaining that the cheese moon needs to be physically larger than the old moon to retain the same amount of mass. Mess around with the moon’s mass and tides get thrown out of whack. But a larger-than-moon-size cheese must compress as it orbits the Earth, so Scalzi imagines the cheese moon erupting as it squirts water from its innards. This is all very sciency, as a reader would expect from Scalzi, but it dances around the question of how the moon changed into a sphere of cheese.
Scalzi explores how the moon’s transformation is greeted by politicians, the media, scientists, wealthy business leaders, members of the clergy, the movie industry, and others. In fact, each chapter tends to focus on new characters who are caught up in the moon crisis. A cheese-related sex scandal involving a congressman and a retired sex worker might be the strangest response.
A chunk of the cheese moon breaks off during an eruption and is projected to smack into the Earth in about two years, causing an extinction event. Some people decide it’s time to start executing their bucket list. Scalzi imagines that bankers will use AI to keep their banks running after all the tellers decide they don’t want to be working during their final days of existence.
The funniest bit involves a company that designed a moon lander for NASA. The company’s CEO is jealous of, and in competition with, Jeff Bezos and Elon Musk. He makes an unlikely plan to take the lander on an unsanctioned mission to visit the cheese moon.
But back to the science. I wondered how Scalzi was going to pull this off, given the lack of any credible explanation for the moon’s sudden transformation into a cheesy mass. While at least one of his books flirts with Intelligent Design as a rational explanation of life on Earth, Scalzi is a scientist at heart. He nevertheless includes a preacher in the plot and gives the preacher a chance to encourage his parishioners to cling to their faith in times of trouble.
I won’t spoil the ending, but I will say that it disappointed me by failing to provide a definitive resolution of the mystery. Scalzi presents (but does not endorse) a theory, popularized on conspiracy websites, but the theory doesn’t explain how the moon rocks on Earth transformed. The silly premise and the absence of a legitimate (even if farfetched) explanation to support it undermines the novel as a work of science fiction, so maybe the book is best seen as a comedy fantasy sprinkled with bits of science. As a funny look at how people might respond to end times that are still a couple years distant, the story generates enough chuckles to make it a good beach read.
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