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When an interstellar exploration crew encounters a mysterious crimson planet that doesn't exist on their instruments, they realize they have stumbled into a cosmic mirage where two universes are colliding.
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Comet was one of the shorter-lived pulp science fiction magazines — it ran for only five issues in 1940 and 1941 before folding — but in that brief window it published work by writers who went on to become genre fixtures. Millard V. Gordon is a name that appears in a handful of early pulp credits and not much else, which makes “The Planet of Illusion” a small find: a story that does something genuinely clever with a premise that could easily have been lazy.
The setup is pure pulp. Deep space, four men on an interstellar explorer, an uncharted planet that shouldn’t exist, ships that materialize from nowhere, weapons that refuse to work. The twist, when it arrives, is one of the more satisfying solutions in early science fiction: not a supernatural explanation, not a deus ex machina, but a piece of physics logic that retroactively explains every strange detail the story has assembled.
The impossible things weren’t impossible. They were just happening in the wrong universe.
The Checklist of the Inexplicable
“The Planet of Illusion” is quietly doing something structural that deserves attention.
From almost the first page, Gordon is building a list. The space-chart fails to register the planet. The weapons fire without effect. The alien beams are visible in the vacuum of space, where there is no medium for light to scatter through and make itself seen. A piece of wire trails from one of the alien ships as though caught in a breeze, in the airless void between stars.
Each of these details is presented as baffling and left unresolved. Dr. Seaward keeps cataloguing them — marvellous and impossible, we’ve run into a swarm of impossibilities today — with the exasperation of a scientist whose framework keeps encountering data it can’t accommodate. The story is doing something specific here: it’s making a promise that all of these impossible things will eventually resolve into a single elegant explanation.
When Broster delivers that explanation — the space-time envelope, the warp, the double mirage — it hits with the satisfying click of a good mystery solution. Every item on the impossibility checklist dissolves. The space-chart couldn’t register the planet because the planet had no gravitational waves in their universe. The weapons were useless because the alien ships weren’t physically present. The beams were visible because they were propagating through air, the atmosphere of the alien planet, which overlapped with their space at the point of the warp. The trailing wire: wind. The ruddy red of everything: the red end of the alien spectrum was the only part penetrating through.
The story earned its solution by laying the groundwork carefully. That’s rarer than it sounds in 1941 pulp fiction.
Two Fleets of Ships, Both Equally Confused
The story’s most underappreciated element is the symmetry of the situation.
The crew of the Astralite is frightened. They’re surrounded by alien ships that appeared from nowhere, whose weapons they can’t resist and whose intentions they can’t determine. They decide to crash the planet rather than surrender. They fire their weapons — nothing. They accelerate into what they believe is their destruction.
But on the other side of the warp, the alien fleet is having exactly the same experience.
Out of nowhere, in what their instruments show as empty space, a strange violet ship appears heading directly for their planet. Their weapons don’t seem to affect it. It keeps coming. It seems to pass through the planet entirely. To them, the Astralite is the inexplicable threat, the impossible visitation that their instruments and weapons cannot account for.
Broster articulates this cleanly — it must have seemed to them that we went right through their planet — but the story is saying something broader. The impossible thing, seen from the other direction, is you. The monster is always the stranger, and the stranger always experiences themselves as merely trying to get through the day.
The double mirage is not just a physics phenomenon in this story. It’s a perspective shift. Both crews were terrified of each other for no reason that would survive an explanation, if an explanation were possible across the boundary of the warp.
The Genre Tradition of the Space Warp
By 1941, the parallel universe and space-warp concepts had been circulating in science fiction for about a decade — H.G. Wells had been playing with adjacent dimensions since the 1890s, and the pulps had been exploring multiverse premises throughout the 1930s. What Gordon does with the concept is slightly different from the standard treatment.
Most parallel universe stories of the era were interested in the other universe — what it looked like, who lived there, what rules governed it. The alien civilization on the red planet is barely sketched in “The Planet of Illusion”; we know it’s red, enormous, apparently inhabited by beings who build spaceships and don’t appreciate uninvited visitors. That’s all. Gordon isn’t interested in them as subjects. He’s interested in the warp itself: the physics of the encounter, the symmetry of the mutual misapprehension, the moment of explanation that makes the impossible retroactively sensible.
This puts the story closer to the detective fiction tradition than to the adventure tradition. The mystery was never going to be solved by fighting or escaping. It was going to be solved by understanding — by having someone sit down, once the danger had passed, and say: here is what was actually happening, and here is why each inexplicable thing makes complete sense once you know what you’re looking at.
Seaward does this. He’s been cataloguing the impossibilities all along, which is why he’s ready with the framework the moment the danger clears. We’ve all known that there are many universes beside ours. He had the theory. He just needed the data the encounter provided.
“Let’s Go Back and Have a Good Look”
The story’s final beat is the one that most clearly marks it as a product of early Golden Age optimism.
They’ve just nearly died — accelerated a spaceship into a planet at collision speed, expecting to be volatilized — and when they come through to find themselves unharmed in open space, the first response is curiosity. They want to go back. They want to photograph the warp, document the phenomenon, give the alien fleet another look at the strange violet ship from another universe. They laugh about it. We’ll give their fleet and their planet the jitters again.
This is the spirit that runs through the best early pulp science fiction: that the universe is full of inexplicable things, and the right response is not terror but investigation. Not every story gets to end this way — some of the stories in this series end in catastrophe, or ambiguity, or the quiet recognition that some things are better left as questions. But the ones that do end in this spirit have something genuinely worth celebrating. The crew of the Astralite came within seconds of dying and came out the other side wanting to go back for a better look.
That impulse — to return to the impossible thing with better instruments and fewer weapons and more time — is one of science fiction’s oldest and best ideas.
