The farthest any human has ever traveled from Earth is roughly 406,773 kilometers — the four astronauts of Artemis II, who broke Apollo 13's 56-year-old record on a lunar flyby in April 2026. That's an unfathomable distance when you actually picture it. And yet: humanity's most distant machine is about 65,000 times farther away. It launched in 1977, still sends faint signals home, and has never once landed anywhere. We've been sending probes into deep space since the dawn of the Space Age — further, deeper, into stranger places. Some are still talking. Some have gone silent. Together they form a ranking that shows just how far human curiosity reaches.
This is a ranking of the ten farthest voyages in human history — not the missions we're most proud of, but the ones we sent furthest away. Seven of them are open below. The three that broke records are waiting in the deck.
The List
It landed on Mars on the seventh anniversary of Apollo 11's first step on the Moon — deliberate, not coincidental.
Viking 1 touched down on Chryse Planitia on July 20, 1976 — exactly seven years to the day after Armstrong and Aldrin walked on the Moon. The Soviet Union's Mars 3 had become the first spacecraft to soft-land on Mars in 1971, but it transmitted for only 14.5 seconds before falling silent, possibly knocked out by a planet-wide dust storm. Viking 1 was different. It operated for six years, becoming the first machine to conduct biology experiments on another world, hunting for any whisper of life in Martian soil. The experiments were inconclusive — a legacy of ambiguity that still troubles planetary scientists today.
In an age when most rovers are measured in hundreds of days of operation, Viking 1's endurance feels almost reckless. It stopped sending signals in 1982, but its lander still sits on Mars, inert and alone, waiting for visitors that might not arrive for centuries.
While circling Mars, it found water — not ancient, frozen memories of it, but liquid water, still present beneath the ice, right now.
ESA's Mars Express arrived at Christmas 2003. Its companion lander, Beagle 2, was supposed to descend to the surface. It never transmitted. For over a decade, Beagle 2 was considered a total loss — until 2015, when one of Mars Express's cameras photographed it from orbit, sitting in a crater where it had indeed landed, but failed to communicate.
The orbiter itself became something of a European survivor story. Its camera has been mapping Mars in high definition for more than twenty years, and in 2018 it announced something that changed the conversation about Mars entirely: beneath the southern ice cap lies a body of liquid water. Not a global ocean under the ice, the theory went, but a sub-glacial lake. Water in the present tense. Mars suddenly seemed less a tomb and more a place where something might, impossibly, still be alive.
Five point four grams — smaller than your thumb — collected from 340 million kilometers away and brought home.
Japan's Hayabusa2 is the second act of a national obsession with asteroid dust. The first Hayabusa went to asteroid Itokawa and returned with grains so fine you could barely see them. Hayabusa2 went further, to Ryugu — a near-Earth asteroid that has circled the Sun since before the planets settled into their current orbits. What made Hayabusa2 different was that it didn't just scrape the surface. It fired a projectile into Ryugu, creating a crater and blasting out material from deep inside the asteroid's body.
The capsule returned to Earth on December 5, 2020, landing in the Australian outback with 5.4 grams of primordial rock. Analysis revealed amino acids — the building blocks of life — formed in the asteroid's chemistry four and a half billion years ago. It was a whisper suggesting that the ingredients for life might be common across the solar system, written in rock older than Earth itself.
It took ten years to reach a four-kilometer dirty snowball, and then — impossibly — landed on it.
No spacecraft had ever orbited a comet before Rosetta. They had done flybys — fast passes that gathered data and left. But Rosetta matched Comet 67P's velocity and stayed, circling it for over two years. The comet turned out to be shaped like a rubber duck, two halves fused together in some collision billions of years ago. The images were so detailed, so intimate, that you could see the topography change as solar heating sent geysers of dust erupting from 67P's surface.
Then came Philae, the lander — a box with legs that descended to the comet's surface on November 12, 2014. It bounced. Twice. And ended up in shadow, where its solar panels collected almost no power. It transmitted data for roughly 60 hours before its battery died. (It briefly stirred back to life in mid-2015 when sunlight reached it again.) But those few days of operation contained measurements of organic molecules on the comet's surface, and something else: the water ice on 67P had a different chemical signature than Earth's oceans. It suggested that comets, long suspected as water-delivery vessels to the young Earth, might not have been the source after all. Rosetta's final act was a controlled dive into the comet itself, transmitting data all the way down.
A broken antenna, hundreds of millions of kilometers away, fixed by reprogramming the spacecraft from Earth.
Galileo launched from the Space Shuttle in 1989 and arrived at Jupiter in 1995 to a problem: its high-gain antenna wouldn't fully open. Years in space had jammed the deployment mechanism. In an engineering feat that still astonishes, NASA's team rewrote the spacecraft's entire communication protocol, compressing data so severely that Galileo could send useful science back over the low-gain antenna at a tiny fraction of its intended bandwidth. It worked. The mission continued for eight more years.
That broken antenna meant Galileo had to be creative, and it was. The spacecraft released a probe into Jupiter's atmosphere that radioed back the first direct measurements from inside a gas giant before the crushing pressure killed it at 58 minutes. Galileo also discovered evidence of liquid water oceans beneath the ice shells of three of Jupiter's largest moons — Europa, Ganymede, and Callisto. It watched Comet Shoemaker-Levy 9 slam into Jupiter with impacts large enough to leave scars the size of Earth. When its fuel ran low, NASA chose a fitting end: a controlled dive into Jupiter itself, ensuring the spacecraft could never contaminate the ice moons that orbited below.
Thirteen years orbiting Saturn. And on a single day in 2005, Huygens parachuted through methane clouds and photographed an alien sky.
Cassini-Huygens is perhaps the most scientifically productive spacecraft ever built. For thirteen years it orbited Saturn, the ringed giant that haunted humanity's dreams for centuries before we could reach it. The Huygens probe separated in late 2004 and descended through Titan's thick atmosphere on January 14, 2005, revealing a world that shouldn't exist: hydrocarbon lakes and seas covering the polar regions, methane rain instead of water, a geology as complex as Earth's but written in a chemistry alien to everything we know.
But Cassini's real revelation came from the small moon Enceladus. Its cameras spotted geysers erupting from the south pole — water ice and organic compounds blasting into space. Further study revealed a global ocean of liquid water beneath Enceladus's ice shell, heated by tidal friction. A small moon with all the ingredients for life as we understand it: liquid water, energy, and chemistry. The implications were staggering. Somewhere in Saturn's system, in the dark beneath the ice, conditions might exist for life to begin.
Cassini's end, in September 2017, was its own kind of poetry: a final dive into Saturn's upper atmosphere, burning up in real time while sending data back to Earth. Not a quiet retirement, but a controlled descent into the thing it spent two decades studying — done deliberately, to keep its hardware from ever drifting onto Enceladus or Titan and contaminating worlds where life might one day be found.
Nine and a half years of travel for a single flyby — and in those few hours, every assumption about Pluto fell apart.
New Horizons launched on January 19, 2006, one of the fastest objects ever sent into space. In its cargo was centuries of human curiosity about Pluto, that distant speck that had been photographed only as a smudge of light. For nine and a half years it flew, passing Jupiter for a gravity boost, falling further from the Sun, falling into the cold.
On July 14, 2015, at a distance of only 12,500 kilometers from Pluto's surface, New Horizons sent back the first detailed photographs. The images shattered every assumption. Pluto had mountains made of water ice three kilometers tall. Its surface bore a massive heart-shaped plain of nitrogen ice, larger than Texas. Its atmosphere was thinner and stranger than predicted. It was not a dead world, but a geologically complex place.
The cruelty of the timing was perfect: seven months after New Horizons left Earth, the International Astronomical Union reclassified Pluto as a "dwarf planet" in August 2006. For another nine years, the spacecraft hurtled through space toward a world that the astronomical community had officially demoted. When it arrived, Pluto's images were so compelling that it didn't matter what we called it. New Horizons is still traveling, still exploring the frozen wanderers of the Kuiper Belt, still sending back data from beyond the edge of the planetary solar system.
Why No Humans in the Top 10?
Because we stopped going out. Until April 2026, the record had been held for 56 years by Apollo 13, which traveled 401,056 kilometers from Earth in 1970 — further than any human had ever been. Artemis II then nudged that mark to roughly 406,773 kilometers on a lunar flyby. Both records exist for two reinforcing reasons: the spacecraft never entered lunar orbit but swung wide of the Moon on a free-return trajectory, and the Moon was near its apogee — its farthest point from Earth, around 405,500–406,700 km — at both flights. Apollo 13 was supposed to land on the Moon, but after the oxygen tank explosion the astronauts had to abort and used the Moon as a gravitational slingshot back to Earth. No human has set foot on the Moon since Apollo 17 in 1972 — and Artemis II flew past without landing either. Humanity has never traveled beyond the Moon's neighborhood. Not because it couldn't, but because it's prohibitively expensive and the risk is enormous. A probe needs less life-support, weighs less, costs a fraction. So we send machines. And these machines have gone further than we ever will. They travel alone through deep space, sending faint signals back that arrive ever more slowly, and don't mind the silence. That's what space exploration looks like in our age.
The three spacecraft in the locked section above will outlive every human being alive today. They carry messages to whatever intelligence might find them — Voyager 1 and 2 carry the Golden Record, assembled by Carl Sagan and Ann Druyan, and Pioneer 10 carries the Pioneer Plaque. If they are ever found, they will be messages from an era when humans still believed the universe was listening. And maybe, against the odds, it was.
Sources
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- NASA. Solar System Exploration — Missions. solarsystem.nasa.gov
- NASA. Artemis II Mission. nasa.gov
- ESA. Mars Express Mission. esa.int
- ESA. Rosetta Mission. esa.int
- JAXA. Hayabusa2 Mission. jaxa.jp
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- Altwegg K. et al. 67P/Churyumov-Gerasimenko, a Jupiter family comet with a high D/H ratio. Science, 2015.
- Naraoka H. et al. Soluble organic molecules in samples of the carbonaceous asteroid (162173) Ryugu. Science, 2023.
- Lebreton J.-P. et al. An overview of the descent and landing of the Huygens probe on Titan. Nature, 2005.
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