A History of Martians

No Martians have ever been found. What follows is a history of the idea of them — a two-century record of humans looking at a red dot and filling in the rest.

The canals (1877–1910)

In 1877 the Italian astronomer Giovanni Schiaparelli mapped faint linear markings on Mars and called them canali — Italian for channels, meaning natural grooves. English coverage translated it as “canals,” a word that implies engineers. Percival Lowell took the implication and ran: from his observatory in Flagstaff he published three books arguing that a dying civilization was irrigating a drying planet from its polar caps. Better telescopes eventually showed the canals were an artifact of the eye connecting scattered features at the limit of resolution.

The invaders (1897–1938)

H. G. Wells published The War of the Worlds in 1897, one year before Lowell's first Mars book, and inverted the sympathy: the dying civilization does not irrigate, it emigrates. The novel established the template — the tentacled aggressor, the useless artillery, the microbial ending. Orson Welles's 1938 radio adaptation is remembered for a nationwide panic that, per later research, was mostly manufactured by newspapers with a grudge against radio.

The sympathetic Martian (1912–1963)

Edgar Rice Burroughs's Barsoom gave Mars a romance and a vocabulary. Ray Bradbury's The Martian Chronicles (1950) made the Martians elegiac — telepathic, golden-eyed, already nearly gone when we arrive, so that the colonists become the Martians by the last page. Robert Heinlein's Stranger in a Strange Land (1961) reduced the species to a single human raised by them and gave English the verb grok.

The flyby (1965)

Mariner 4 returned twenty-two photographs of a cratered, apparently lifeless surface, and measured an atmosphere under one percent of Earth's. The canals were gone for good. Viking 1 and 2 landed in 1976 carrying biology experiments; one, the Labeled Release test, produced a signal consistent with metabolism, but the absence of any detected organic molecules led most scientists to a chemical explanation. The debate has never fully closed.

The Face (1976–2001)

A Viking orbiter photographed a mesa in Cydonia that, at that resolution and sun angle, looked like a human face. It sustained twenty-five years of books and documentaries until Mars Global Surveyor re-imaged it in high resolution and revealed an ordinary eroded hill — a second Lowell, on a shorter timescale.

What is actually there

Rovers have since established that Mars had standing water, neutral-pH lakes, and the organic chemistry that life would need. Curiosity has measured seasonal methane fluctuations that no one has explained to everyone's satisfaction. The live question is no longer whether Martians built canals, but whether anything microbial ever got started — and whether we would recognize it if we tripped over it.

The through-line is consistent: every generation gets exactly the Martians its instruments allow it to imagine.