When it comes to the cosmos, there have always been bold individuals—people claiming to have found undeniable proof of alien life—who sparked imaginations and debates across centuries.
Why People Claiming Evidence Captivates Us
From moonlit sketches to radio‑signal fantasies, each claim tells a story about humanity’s yearning to know whether we are truly alone. Let’s dive into the ten most memorable claimants.
10 Franz von Paula Gruithuisen
In 1824 the German astronomer‑physician Franz von Paula Gruithuisen unleashed a sensational paper titled “Discovery of many distinct traces of lunar inhabitants, especially one of their colossal buildings.” Over the next 28 years he argued that a genuine lunar metropolis existed near the crater Schroter.
Gruithuisen’s telescope revealed what he interpreted as towering structures, artificial waterways, and even roads. He rendered exquisitely detailed lunar maps, but his contemporaries largely dismissed the “Lunar City” as fanciful nonsense.
9 Giovanni Schiaparelli
Italian astronomer Giovanni Schiaparelli produced some of the most accurate 19th‑century observations of Mars. In 1877 Mars swung close to Earth, giving him a prime view of the Red Planet.
He charted light and dark patches, assigning them names, and famously sketched a network of canali—the Italian word for “channels.” Though he used the term interchangeably with “rivers,” the idea of artificial canals quickly captured the public imagination.
Schiaparelli’s color‑blindness altered his perception of Martian hues, leading him to see features that others missed. He never declared the canals artificial, but he left the door open for any possibility.
8 Guglielmo Marconi And Nikola Tesla
While best known for pioneering radio, both Guglielmo Marconi and Nikola Tesla believed they were intercepting Martian chatter. Tesla first floated the notion of using radio waves to contact extraterrestrials around 1896.
In 1899 his Knob Hill Tesla coil receiver picked up a regular, repeating signal. Convincing himself it originated from Mars, Tesla separated the pattern into groups that modern historians attribute to either misread data or interference from Jupiter’s magnetosphere.
Marconi, too, reported signals he interpreted as Martian proof, fueling a wave of optimism that radio could become humanity’s interplanetary telephone.
7 Sir David Brewster
When scientists confirmed that Earth was just one of many planets, theologians scrambled to explain why the heavens weren’t empty. The prevailing notion—cosmic pluralism—asserted that other worlds must be inhabited by devout, God‑fearing Christians.
Sir David Brewster offered a philosophical proof: because planets looked superficially Earth‑like, they must have been created for the same purpose—supporting life. He likened the argument to the eye: different shapes serve the same function, so planets, regardless of size, exist to host living beings.
6 John J. O’Neill
Science editor John J. O’Neill of the New York Herald Tribune was fascinated by lunar geography. On July 29, 1953, he announced a startling discovery: a bridge spanning two rocky outcrops in the Mare Crisium crater.
Estimating the structure to be about 19 km (12 mi) long, O’Neill shared his observations with peers, and several astronomers initially corroborated the feature.
Later, sharper telescopes revealed that the “bridge” was merely an illusion—light and shadow playing tricks on the eye. Nonetheless, the story lived on, inspiring Arthur C. Clarke’s later fiction.
5 Mikhail Vasin And Alexander Shcherbakov
Members of the Soviet Academy of Sciences, Mikhail Vasin and Alexander Shcherbakov, struggled to publish their moon‑theory in Sputnik. They argued that the Moon’s craters were too shallow relative to their diameters to be impact scars on solid rock.
From this, they concluded the Moon could not be a natural satellite but a massive space‑station—perhaps a galactic Noah’s Ark harboring an ancient civilization wandering the cosmos for millions of years.
The scientific community, however, remained unconvinced, and their hypothesis faded into obscurity.
4 Percival Lowell
Giovanni Schiaparelli first mapped the so‑called Martian canals, but it was Percival Lowell who turned them into a tale of a dying civilization. Lowell’s books and sketches portrayed the canals as desperate engineering feats to siphon ice‑cap resources.
He even claimed similar canals existed on Venus, a notion that raised eyebrows. Modern analysis suggests Lowell’s maps mirrored the pattern of blood vessels in a human retina—he was, in effect, projecting his own eye onto the planets.
3 Richard Proctor
During the 1860s and 1870s British astronomer Richard Proctor surveyed the solar system for life‑friendly environments. Using Darwinian principles, he argued that each planet’s unique conditions would nurture specialized organisms.
He singled out Mars as a miniature Earth—complete with oceans and water—making it the prime candidate for life as we know it. By contrast, he believed Jupiter could only support minuscule life‑forms, if any.
2 Reverend Thomas Dick
Scottish theologian Reverend Thomas Dick sought to reconcile science and faith by proposing a grand cosmic plan. He argued that the same rules governing Earth applied universally, so every planet should host life.
Dick even attempted a crude population estimate: using England’s density of 108 people per square kilometre, he extrapolated numbers for each planet, its moons, and even Saturn’s rings. He concluded Jupiter harboured seven trillion inhabitants, with its satellites adding another 27 billion.
1 Leonid Ksanfomaliti
In 2012, Moscow Space Research Institute professor Leonid Ksanfomaliti announced a startling claim: photos from the 1982 Venera 13 mission to Venus revealed a gigantic scorpion scuttling across the alien surface.
He pointed to a series of images where a body and tail appeared to move frame‑by‑frame before vanishing from view. A second Venus probe seemed to capture a similar silhouette, sparking brief excitement.
NASA later clarified that the “creature” was nothing more than the spacecraft’s camera lens cap—an ordinary piece of equipment masquerading as extraterrestrial life.
Further Reading
Whether you believe they are out there or not, you can still enjoy reading and speculating! So here are a few more ET lists for your reading pleasure:
- 10 Government Officials Who Admitted The Existence Of Aliens
- 10 Bizarre Ways Scientists Believe Aliens Will Contact Us
- Top 10 Alleged Battles Between Humans And Aliens
- 10 Crazy Conspiracy Theories About Extraterrestrial Beings