The Quest for Life on Mars: From Early Observations to Modern Exploration

Name: История поисков жизни на Марсе
Uploaded: 2026-01-10T18:54:07.683282+00:00
Channel: Julia Bolchakova
Description: Summary and key takeaways on The Quest for Life on Mars: From Early Observations to Modern Exploration, covering Introduction The episode commemorates

Julia Bolchakova

Jan 10, 2026

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4 min read

YouTube video ID: 5QEZyyXaCKo

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Introduction

The episode commemorates Cosmonautics Day and tackles the age‑old question, “Is there life on Mars?” It traces how the idea evolved from naked‑eye speculation to sophisticated robotic missions, highlighting why the search matters for understanding life in the universe.

Observing Mars from Earth

The Moon is visible to the naked eye; Mars appears as a tiny star, about 80–250 times smaller than the Moon even at opposition.
Telescopic detail is limited by Earth’s turbulent atmosphere, which acts like ever‑changing lenses and blurs fine features.
Before spacecraft, astronomers could only record blurry light‑and‑dark patches and polar ice caps, never true craters.

The Canal Era: Schiaparelli’s "Canali"

In the 1877 great opposition, Italian astronomer Giovanni Schiaparelli reported a network of dark lines he called canali (Italian for channels).
Translation turned canali into “channels,” implying artificial structures to English‑speaking readers.
Early observers also noted seasonal changes in the polar caps and surface markings, interpreting them as water‑filled seas and canals.

Percival Lowell and the Martian Civilization Myth

Lowell, inspired by contemporary canal‑building feats (Suez, Panama), championed the idea that the canals were engineered by an advanced Martian society.
He built an Arizona observatory and published sensational claims, including a 1,000‑mile canal discovered in 1909.
Popular culture seized on the notion; H.G. Wells used a 1894 “strange light” report for The War of the Worlds.
Scientific peers remained skeptical: spectroscopic studies showed no water or oxygen, and detailed maps by Eugène Antoniadi revealed no canals.

Early Space Probes and the Harsh Reality

Mars 1 (1962): Lost contact before reaching the planet.
Mariner 4 (1965): Returned 21 grainy photos; Mars looked Moon‑like, barren.
Mariner 9 (1971): First orbiter, mapped 85 % of the surface, found no life signs.
Viking 1 & 2 (1976): First successful landers; soil analyses detected no organic molecules, and atmospheric pressure (≈0.6 % of Earth) was too low for liquid water.
Environmental extremes: average temperature ≈ ‑63 °C, CO₂‑rich thin atmosphere, planet‑wide dust storms, intense UV radiation.

Evidence of a Watery Past

Mars Pathfinder (1997): Mini‑rover found rounded stones indicating ancient catastrophic flooding in Ares Vallis.
Spirit & Opportunity (2004): Confirmed widespread past water activity; discovered silica deposits typical of hot‑spring environments, suggesting possible habitats for extremophiles.
Curiosity (2012): Detected ancient lake sediments in Gale Crater, measured organic carbon compounds, and observed seasonal methane spikes—on Earth, methane is largely biological.
Mars Express (2018): Radar hinted at a subglacial lake beneath the southern polar ice cap, analogous to Earth’s Lake Vostok, a potential refuge for microbes.

The Ongoing Search for Biosignatures

Modern missions focus on indirect signs of life: complex organics, mineralogical patterns, isotopic ratios, and gases like methane.
The definition of life used by NASA: a self‑sustaining chemical system capable of Darwinian evolution.
Researchers consider exotic possibilities, e.g., peroxide‑based microbes that could survive Mars’ low temperatures and hygroscopic environment.
Viking’s 1970s nutrient‑broth experiments produced a brief CO₂ release; some interpret it as a chemical reaction, others as a missed microbial signal.

Atmospheric Loss and Future Prospects

Mars once possessed a thicker atmosphere; the weak magnetic field allowed the solar wind to strip it away over billions of years.
Ongoing loss explains the current cold, dry, radiation‑intense surface.
Perseverance (2021): Collects sealed rock samples for a future return mission (planned for the 2030s). The samples could contain dormant microbes, raising planetary‑protection concerns.
Sample‑return will enable Earth‑based laboratories to search for microfossils, isotopic biosignatures, and perhaps living organisms.

Why the Search Matters

Finding even a single fossilized bacterium would demonstrate that life arises naturally, not as a rare accident.
It would reshape the answer to the profound question, “Are we alone in the universe?” and guide the search for life beyond Earth.

Conclusion

The journey from imagined canals to sophisticated rovers shows how scientific rigor replaced speculation, yet the mystery endures. Mars may have been a warm, watery world billions of years ago, and traces of that past—organic molecules, methane, subsurface lakes—keep the hope alive that life once existed, or perhaps still persists in hidden niches.

Mars transformed from a canvas for 19th‑century fantasies into a scientifically studied planet that once harbored water and may still shelter microbial life. While no definitive proof of life has been found yet, each mission brings us closer to answering the timeless question of whether we are alone in the cosmos.

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Why the Search Matters

- Finding even a single fossilized bacterium would demonstrate that life arises naturally, not as a rare accident. - It would reshape the answer to the profound question, *“Are we alone in the universe?”* and guide the search for life beyond Earth.

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Full Transcript YouTube

No, this isn’t an April Fool’s edition—it’s a special episode for Cosmonautics Day or the International Day of
Human Space Flight, depending on where you live. The question “Is there life on Mars?”
is now being discussed completely seriously, even though it has a long and somewhat laughable history.
Mars is—how shall I put this—very far away from Earth. Unlike, say, the Moon,
which is much closer. We can see the Moon with the naked eye, like a saucer in the sky,
and if your eyesight is good enough, you can even spot features on it—seas, mountains, craters.
Mars, on the other hand, appears as nothing more than a tiny star. You can’t see any detail on it at all.
And unlike the Moon,
which obediently orbits Earth on a gravitational leash, Mars follows its own independent
orbit around the Sun, constantly drawing nearer or farther from us.
When it comes closest, it’s called opposition, and that’s when Mars is most visible.
But even at its best, Mars appears around 80 times smaller than the Moon.
Right now, for example, it looks about 250 times smaller than the Moon. So, if you want to observe Mars properly, you’ll need a telescope.
The problem is, you can’t just make a telescope with infinite magnification. The limit
isn’t in the telescope’s technical capabilities—it’s the terrible optical quality
of Earth’s atmosphere, which we have to look through to see space. The atmosphere is full
of air currents of different temperatures, moving in different directions and at different speeds—
something we explained in detail in our tornado video. Even if the air is perfectly dry and transparent—
which is why telescopes are placed in deserts, far from cities—these temperature differences
make light rays bend slightly as they pass through.
 It’s like the sky above us is constantly forming moving lenses out of thin air. As a result, a telescope always
gives us a slightly blurry and unstable image, in which fine details get smeared out.
Clear images of Mars’s surface only became available quite recently,
when spacecraft finally reached it and photographed it up close. Before that,
 even with the best equipment, astronomers could only see this:
Blurry bright and dark patches. Polar ice caps,
 like Earth’s. But no fine details like we see on the Moon—
not a single crater. And the image was unstable, always shifting. Even after photography was invented,
astronomers often preferred to sketch what they saw through a telescope, summarizing hours
 of observation in a single drawing. This is part of why the history of Mars observation is full of sensational claims.
continuous observation with drawings. And this is one of the reasons why the history of Mars exploration is full of sensations.
The world first heard about Martian canals in 1877, thanks to Italian astronomer
Giovanni Schiaparelli. Schiaparelli was a perfectly respectable, internationally recognized scientist.
He graduated from the University of Turin, worked at the Berlin observatory,
 then at Pulkovo near St. Petersburg, and later in Milan. During the “great opposition” of 1877,
when Mars came a mere 56 million kilometers from Earth, Schiaparelli
saw a network of lines on its surface. He called them canali. A quick word on astronomical terminology:
In astronomy, it’s been tradition for centuries to call dark areas on planets’ visible surfaces “seas.”
On the Moon, for example, you’ll find the Sea of Tranquility, the Sea of Clarity, the Ocean of Storms, and so on.
Nobody thinks these are actual seas—they’re just names for regions
 that appear darker than the surrounding lighter “continents.”
Schiaparelli saw dark lines connecting Mars’s “seas.”
He named them canali—a word in Italian that can mean
either natural or artificial channels. But when his work was translated into English,
canali became channels. And in English—as in Russian—
the word “channel” typically implies something artificial, man-made.
While these articles were only read by scientists, no one got too excited.
Everyone understood it was just a naming convention. But unfortunately, it leaked into the press.
At that point, astronomers already knew that Mars had a day length
similar to Earth’s and a similar axial tilt—
meaning it had seasons. They could see
the polar ice caps growing and shrinking with the seasons.
They also saw the outlines of Mars’s seas change—
expanding and shrinking. Today we know Martian dust storms are partly responsible,
but back then, combined with the seasonal melting of polar caps,
these changes looked like snow melting and water filling the seas and canals.
No one yet knew that Mars had almost no atmosphere—
or that its polar caps were mostly made of dry ice (frozen CO₂), not water.
And it’s not like these observations were perfectly consistent.
Reports would periodically appear that Schiaparelli’s canals had vanished,
or that the seas now looked like deserts. This was due
to the poor, blurry views through telescopes. Nearly everything
astronomers thought they were seeing was a kind of optical illusion. Jumping ahead:
when the first Mars rovers started mapping the surface, matching up the data with
existing photos proved nearly impossible. What looked like
a ridge in a photo turned out not to be a ridge at all, and a supposed crater might be a hill.
But at the end of the 19th century, astronomers claimed to see even seasonal
color changes on Mars—valleys blooming with greenery in spring,
as if they’d been flooded with water. And then Lowell returned from Korea.
Percival Lowell likely played the central role in popularizing the idea
that the Martian canals were artificial—and that Mars had an advanced civilization. He was
 a particularly colorful figure. Born into a wealthy, educated, liberal family,
he grew up in an atmosphere that revered science, progress, and freedom of thought.
Which is great—except that it can sometimes dampen critical thinking.
He graduated from Harvard with honors, ran a factory, and spent several years traveling enthusiastically through
the Far East. Lowell wrote books about Korean and Japanese religion, culture and mysticism,
helping to popularize Eastern spirituality in the West.
When he returned to the U.S., he heard about the canals on Mars
and decided to devote the rest of his life to astronomy.
He built an observatory in Arizona—the first observatory intentionally
placed in a remote, high-altitude location to improve telescope imaging.
Then he threw all his considerable talent, energy, and resources
into proving his pet theory: that intelligent life existed on Mars—
not only similar to Earth’s, but actually ahead of us in evolutionary development.
Lowell believed that the entire universe follows certain universal laws of development—
and that even things as seemingly different as Western and Eastern cultures,
or humans and animals, progress along the same path. The idea of Martian canals fit smoothly and logically into this worldview.
As you already know, the second half of the 19th century was the age of grand canal-building projects.
The Suez Canal was completed in 1869, and construction of the Panama Canal began in 1880.
The word canal appeared in newspapers hundreds of thousands of times. These canals were described as enormous,
visible from the Moon, marvels of engineering. Everyone understood that canals meant water, complexity, and
civilization at its peak. So if there were an advanced civilization on another planet,
 of course they would be building canals—canals big enough to see through a telescope.
Lowell believed that all planets follow a shared developmental path.
Mars, being smaller than Earth, had cooled faster and evolved more quickly.
It was, in his view, at a stage of planetary evolution that Earth wouldn’t reach for a very long time. The giant canals
crisscrossing Mars were, according to him, the handiwork of a dying but extraordinarily advanced civilization
struggling to survive in a fading world. Mars was drying up, and the Martians had built these colossal
aqueducts to transport water from the melting polar ice caps. For further details, see Aelita—
because it was thanks to Lowell that the idea of a Martian civilization spread around the globe.
In August 1894, a French astronomer reported flashes of "strange light"
on Mars. Writer H.G. Wells used this report as the spark for his novel
The War of the Worlds. These mysterious lights became the launching
of Martian spacecraft bound for Earth. It was an absolute masterpiece—the first fully realized alien invasion story,
setting the tone and standards for an entire genre that’s still going strong in film today.
In 1909, Lowell announced the discovery of a new 1,000-mile channel on Mars
which he claimed had brought life to what was previously an uninhabited desert. A Chicago paper,
the Evening American, ran a massive front-page headline: “Martians Build New Canal!”.
People expected contact with Martians any day now. One of Lowell’s supporters, William Pickering,
proposed establishing communication with the Martians using giant electric floodlights and a one-kilometer mirror.
—I can’t! I’m dying! Good thing I didn’t wear pants today—you can’t laugh properly in pants!
Despite the public’s enthusiasm for a populated Mars, the scientific community remained, shall we say…
skeptical. As early as 1894, American astronomer William Wallace Campbell 
used spectroscopic analysis to show that Mars’s atmosphere contained neither water nor oxygen. 
French astronomer Eugène Antoniadi created several extremely detailed maps of Mars—
many of the features he named are still used today—
and he saw no canals. In 1907, British naturalist Alfred Russel Wallace
published Is Mars Habitable?, in which he demonstrated that 
Mars’s surface was almost certainly much colder than Lowell had assumed, 
and that its atmospheric pressure was far too low to support liquid water.
So, in short, Lowell was not well respected by his peers. 
This took quite a toll on him—he suffered a nervous breakdown.
And yes, he looked for life elsewhere too: for instance, he claimed to see “spokes” on the surface of Venus, 
 which we now know is completely hidden under thick, opaque cloud cover.
In the end, it quickly became clear that Mars
 had extremely harsh climate conditions. Still, scientists knew that living organisms can adapt
to a wide variety of environments. There were serious attempts to detect
signs of life on Mars—maybe not grand civilizations, but perhaps simpler lifeforms, 
like lower plants. But determining whether microbes or lichens exist on a planet tens of millions of kilometers away?
That’s a nearly impossible task. It was time to go to Mars.
The era of Mars spaceflight began on November 1, 1962, with the launch of 
the Soviet Mars 1 probe. Six months after launch,
radio contact was made for the 61st and final time—after that, it disappeared into deep space,
missing Mars by around 200,000 kilometers.
In the next ten years, there were 14 attempts to send automatic interplanetary stations to Mars.
Only five of those missions achieved any success at all. Reaching Mars is no easy feat—
these missions still push the limits of human technology.
Finally, on July 15, 1965, Mariner 4 passed within 10,000 kilometers of Mars 
and sent back 21 photos of its surface. The images showed a landscape that looked far more like the Moon
than Earth—hardly an encouraging sight. In November 1971, Mariner 9 successfully entered orbit around Mars. 
Over the next 349 days, it transmitted 7,329 images, covering about 85% of the planet’s surface. 
The photos revealed many fascinating new features—and no sign of life.
Next came the effort to actually land a station on the Martian surface—
a task that turned out to be extraordinarily difficult. The first fully operational 
automatic Martian station appeared in 1976: Viking 1. 
It transmitted the first-ever images from the surface of Mars and conducted the first direct analysis
of Martian soil and atmosphere. Soon it was joined by its twin, Viking 2. What the Vikings saw—
and touched with their robotic arms—was deeply disappointing.
Scientists already suspected Mars wasn’t exactly Miami, but they hadn’t realized just how bad it was. 
 The average temperature on Mars is about -63°C. For comparison, Earth’s average temperature—
including Antarctica—is around +15°C. Only the interior of Antarctica has annual averages close to Mars.
On a warm day near the Martian equator,
 it might reach +20°C, but at night it can plunge to -100°C. 
That’s at the equator—at the poles, it’s much worse.
Mars’s atmosphere is 95% carbon dioxide, with the rest mostly nitrogen and argon—
almost no oxygen or water vapor. Mars also experiences planet-wide dust storms 
that can last for months and cover huge areas.
These dust storms are responsible for the seasonal color changes we see through telescopes.
Atmospheric pressure on Mars is more than 166 times lower than on Earth. That fragile atmosphere
offers almost no protection from cosmic radiation. 
Mars is essentially transparent to ultraviolet light—which is deadly to all known forms of life.
So it’s no surprise that neither Viking 1 nor Viking 2
found any organic molecules in the soil. They didn’t find any water, either.
The atmospheric pressure is so low that even if liquid water did somehow appear, 
it would immediately evaporate. You can think of atmospheric pressure like a heavy lid 
 that holds water molecules together. Mars doesn’t have that lid. It’s cold, dusty,
bombarded by meteors, blasted with radiation, unbreathable, and has no watering holes.
“Come visit us in Kolyma sometime!”
“No thanks—better you come to us…”
After yet another disappointment, scientists regrouped. 
 Just because Mars is uncomfortable doesn’t mean life is entirely impossible. 
No palm trees or giant Martian spiders, sure—but even here on Earth, 
life finds ways to survive in places that seem uninhabitable.
Extremophiles are organisms 
that thrive in conditions most living things can’t handle—permafrost, boiling acid,
intense radiation, or deep underground without light or oxygen.
 In recent decades, biologists have discovered an astonishing variety of tiny, 
 hardy, heroic creatures: in Antarctic deserts, on the walls of nuclear reactors,
 in volcanic craters, and in alkaline geysers. Compared to that, Mars no longer seems so hopeless.
Maybe we’ve just been looking in the wrong places?
In 1996, scientists studied a meteorite called ALH84001, found in Antarctica, 
 which was confirmed to have come from Mars. It’s rare, 
but not unique—Earth and Mars, being neighbors, sometimes swap rocks. 
 In this particular fragment of Martian rock, around 4 billion years old, 
they discovered organic molecules, along with minerals whose formation is hard to explain without 
some biological involvement, and structures that resembled fossilized microorganisms on a tiny scale. 
NASA announced that this collection of indirect clues provided strong grounds to suggest
that primitive life might have existed on Mars more than 3.6 billion years ago.
It was a sensation—the first time in a hundred years that scientists seriously talked about potential evidence
of extraterrestrial life. Mars was back in the spotlight. In the late 1990s and early 2000s,
a whole series of missions launched to study its climate and geology.
The Mars Pathfinder lander, with its mini-rover, discovered on the very spot it landed geological evidence
of catastrophic flooding in the Ares Valley: rounded, water-smoothed stones and boulders 
lying among deposits—signs they had once been carried and shaped by powerful water flow.
The Spirit and Opportunity rovers, which arrived in 2004, confirmed
that Mars was once much wetter. In places, Martian rock was literally saturated 
with the byproducts of long-term water interaction. This meant that Mars had once been
much more Earth-like—with rivers, possibly lakes, and a much denser atmosphere.
At one point, Spirit got stuck and, while spinning its wheel, accidentally dug into the soil—
revealing an underlayer of nearly pure silicon dioxide. 
On Earth, this typically forms in hot springs. And hot springs are a favorite habitat 
of extremophile microbes. This discovery led scientists to speculate
that Mars once had thermal springs—potential homes for heat-loving microorganisms.
In 2012, the lab-equipped Curiosity rover landed on Mars.
Within its first few months, it confirmed
that a lake had once existed inside the ancient Gale Crater. Curiosity also
 became the first to detect organic compounds—complex carbon-based molecules—in Martian rock.
At the same time, Curiosity made another intriguing discovery: methane levels 
in the crater’s atmosphere varied with the seasons—rising in summer and falling in winter. On Earth, 
 methane is mostly produced by living organisms. Its presence on Mars—
and its seasonal variation—remains a mystery. But the fact that it’s there keeps hope alive:
maybe bacteria deep underground are still producing it. Maybe, several meters—
or even kilometers—below the surface, where it’s still warm from the planet’s interior, 
tiny pockets of liquid water survive. In that darkness, microbes could be getting energy
 from chemical reactions—oxidizing hydrogen, for example, or reducing sulfates. 
And maybe that’s what’s behind the strange methane traces.
And then it turned out that Mars doesn’t entirely lack water. In 2018, the European Mars Express orbiter
picked up radar data suggesting that beneath
 the southern polar ice cap, a large subglacial lake of what seems to be liquid water is hiding.
Such lakes could be ideal refuges for cold-resistant microbes. For instance,
in a similar subglacial lake—Lake Vostok in Antarctica—scientists found unique communities of extremophile organisms.
Drilling down there will be incredibly difficult, but the very existence of such Martian lakes is inspiring.
The most recent NASA rover, Perseverance, arrived on Mars in February 2021. 
ts main job is to collect rock samples, seal them in sterile tubes, 
and pile them up for future retrieval. To date, we have never brought back 
a single stone from Mars. All the rovers have been one-way missions. The plan is for a special mission in the 2030s 
to retrieve those samples and bring them to Earth.
Some people are already slightly horrified at the idea that those tubes could contain
 living Martian microbes—ones that might survive the trip and the landing. 
And ideally, you really don’t want them chewing through the lab glass afterward.
So it looks like Mars was a much cozier place in the distant past. 
 It was warmer, had liquid water, and an atmosphere. 
But Mars has been losing its atmosphere—and continues to do so. Here’s why.
That giant pot of boiling hydrogen we call the Sun is constantly simmering. From it flows a stream of protons and electrons—
blasting out in all directions. 
This is called the solar wind. Earth is protected from this cosmic breeze by its magnetic field, which deflects
 the incoming particles. But Mars, as measurements have shown, has a magnetic field that is a thousand times weaker than Earth’s.
So the solar wind freely scours Mars, gradually stripping away its atmosphere.
Once, Mars’s atmosphere was much thicker—but now only traces remain. 
And with the atmosphere, it’s possible that life—as we know it—was lost too.
If anything survives, 
we may need to redefine what we mean by "life."
That question—“What is life?”—is no longer just philosophical or abstract.
 It’s becoming practical and specific. What exactly are we even looking for on Mars? It’s hard to find 
a black cat in a dark room—especially if you don’t even know what a cat is.
The question "What is life?" is not at all trivial. Even here on Earth there are gray area examples.
Viruses, for example—they can evolve and reproduce, 
but only inside a host cell. So are they alive? Is a virus a creature—or just a substance? Scientists still debate this.
There’s every chance that alien life might be nothing like anything we know.
NASA often uses this working definition: Life is a self-sustaining chemical system
capable of Darwinian evolution.” That means: a system of molecules that
 (1) sustains itself using energy and nutrients from its environment,
and (2) carries encoded information 
 that can change over generations—evolve, in other words.
If we were to find Martian microbes that “eat,” “exhale,”
reproduce, and evolve—that would be unquestionable proof of life.
But the odds of that are very low. We’ve long since given up hoping
that someone will sniff the rover or try to lick its camera.
So modern efforts focus on biosignatures—the traces life leaves behind. 
 Researchers look for complex organic compounds, microscopic fossils,
or chemical ratios characteristic of living processes.
Still, we operate on anthropocentric assumptions: show us carbon, 
water, DNA/RNA, metabolism. But what if alien life is completely different from ours?
What if it’s unrecognizable? That possibility is seriously
considered, and several fascinating hypotheses are being proposed.
One of them is the idea of “peroxide-based life” on Mars.
Hold onto your hat—this one’s wild.
Some researchers suggested that Martian microbes might use 
 a mixture of hydrogen peroxide and water as their intracellular fluid. Such a mix doesn’t freeze until -56°C
and is hygroscopic—meaning it draws moisture from the air. Back in the 1970s, the Viking landers conducted
experiments to provoke a reaction from Martian life. For example, 
they added nutrient broth to Martian soil and looked for CO₂ gas release.
And CO₂ did start coming out. But it looked more like a chemical reaction
 than anything biological. Still, the lead scientist believed Viking may have 
accidentally encountered an unfamiliar kind of life. If it had splashed nutrient broth
 onto peroxide-based microbes, the cells could have broken apart, releasing gases—
which the Viking instruments picked up. But by then… the organism would’ve been dead. And never found again.
No one is saying that’s exactly what happened. 
But the theory highlights just how alien alien life might be, and how easily we might miss it. So for now, 
the strategy is: look for life we know—so we don’t overlook even that.
But why are we even looking for life on Mars anymore? It’s clearly not 
to dance the polka with Martian ladies. The real question is this:
If we find even one fossilized bacterium on Mars, it would mean
that life in the universe is not a rare, freak accident—but a natural outcome. The question 
“Are we alone in the universe?” starts, in many ways, with this: “Is—or was—there life on Mars?”
Is there life on Mars? Is there not life on Mars?
Science just doesn’t know yet...
That’s all for now. Like, subscribe to the channel, check out the blog—
best wishes to you and a happy trip around the Sun. And onward—through the spiral arms of the Milky Way, 
around the black hole in Sagittarius, toward our rendezvous with Andromeda.