The Moon harbors vast underground tunnels that could shelter human beings
Beneath the ancient volcanic plains of the Moon, where silence has reigned for billions of years, scientists have confirmed the existence of vast underground tunnels — natural shelters carved by lava and preserved by time. Using radar data gathered by NASA's Lunar Reconnaissance Orbiter, an international team led by the University of Trento has transformed long-held suspicion into verified fact: the Moon keeps habitable spaces within itself, waiting. As humanity prepares to return to the lunar surface, these hidden corridors offer not just protection from an unforgiving environment, but a philosophical reframing of what it means to make a home beyond Earth.
- For the first time in history, radar data has confirmed a hollow lava tube beneath Mare Tranquillitatis, ending decades of speculation about what lies beneath the Moon's shadowed pits.
- The lunar surface is brutally hostile — temperatures swing 300 degrees Celsius between light and dark, radiation strikes 150 times harder than on Earth, and micrometeorites travel at lethal speeds.
- These underground tunnels maintain a stable 17°C and offer natural shielding, making them potentially the most valuable real estate in the solar system for future human settlement.
- Engineers and space agencies now face the formidable challenge of designing robots, technologies, and supply chains capable of transforming ancient lava caves into functional human habitats.
- With NASA's Artemis III set to land astronauts on the Moon in 2026, the window between discovery and deployment is narrowing — and the lava tubes may define humanity's path to permanent lunar presence and, eventually, Mars.
Por mais de uma década, cientistas sabiam que a superfície da Lua estava marcada por mais de duzentas aberturas sombrias. O que existia sob elas permanecia mistério. Agora, pela primeira vez, uma equipe internacional confirmou o que se suspeitava há muito: a Lua abriga vastos túneis subterrâneos, esculpidos por fluxos de lava ancestrais, que um dia poderão abrigar seres humanos.
A descoberta veio de dados coletados em 2010 pelo Lunar Reconnaissance Orbiter da NASA, que disparou ondas eletromagnéticas em direção à superfície lunar e captou os ecos do radar. Um desses ecos emergiu de um poço em Mare Tranquillitatis. Usando técnicas avançadas de processamento de sinais, uma equipe liderada pela Universidade de Trento, na Itália, decodificou esses ecos e construiu um modelo do que havia sob a abertura: um tubo de lava oco, estendendo-se por dezenas de metros, com forte possibilidade de que cavernas ainda maiores existam além do alcance do radar. O estudo foi publicado na Nature Astronomy.
A importância da descoberta fica clara quando se considera o ambiente lunar. Na face iluminada, as temperaturas chegam a 127°C; na face escura, caem para -173°C. Dentro das cavernas, porém, a temperatura permanece estável em torno de 17°C. Os tubos também oferecem proteção natural contra radiação solar — cerca de 150 vezes mais intensa do que a que chega à Terra — e contra impactos de micrometeoritos.
Para futuros astronautas, essas cavernas representam uma solução elegante: em vez de construir estruturas pressurizadas na superfície hostil, os exploradores poderiam se instalar no subsolo e deixar a própria geologia da Lua fazer grande parte do trabalho de proteção.
Os desafios são imensos — novas tecnologias, robôs especializados e cadeias de suprimento precisarão ser desenvolvidos. Mas o cronograma avança. A missão Artemis III da NASA, prevista para setembro de 2026, pousará astronautas na superfície lunar pela primeira vez desde 1972. A agência declarou sua intenção de estabelecer uma presença permanente na Lua — uma base a partir da qual alcançar Marte. Aqueles tubos de lava, antes sombras misteriosas em imagens orbitais, podem em breve se tornar endereços.
For more than a decade, scientists have known that the Moon's surface is pocked with shadowed openings—over two hundred of them discovered since 2009. What lay beneath those dark mouths remained a mystery, a question that hung in the vacuum. Now, for the first time, an international team has peered inside one of them and confirmed what researchers have long suspected: the Moon harbors vast underground tunnels, carved by ancient lava flows, that could one day shelter human beings.
The breakthrough came from data collected in 2010 by NASA's Lunar Reconnaissance Orbiter, which passed dozens of kilometers above the lunar surface firing electromagnetic waves downward and listening for the radar echoes that bounced back. One of those echoes came from a pit in Mare Tranquillitatis, a dark plain on the Moon's near side. Using advanced signal-processing techniques, a team led by scientists at the University of Trento in Italy decoded those echoes and built a model of what lay beneath the opening. The result was unmistakable: a hollow lava tube, extending for dozens of meters underground, with the strong possibility that far larger caverns exist beyond what the radar could reach.
Leonardo Carrer, an assistant professor at Trento and one of the study's authors, described the moment of discovery with scientific restraint: the most probable explanation for their observations was an empty lava tube. It was the first time radar data had been used to demonstrate the existence of such a structure on the Moon. The finding, published in Nature Astronomy, transformed decades of speculation into confirmed fact.
Why this matters becomes clear when you consider what the Moon is actually like. On the sunlit side, temperatures climb to 127 degrees Celsius. On the dark side, they plummet to minus 173 degrees. But inside those caves, the temperature hovers around 17 degrees Celsius and remains relatively stable. The tubes would also provide natural shielding from solar radiation—radiation about 150 times more intense than what reaches Earth's surface—and from the constant threat of micrometeorite impacts, tiny rocks traveling at tremendous speed that could puncture a habitat or damage equipment.
For future astronauts, these caves represent something close to a gift. Rather than building pressurized structures on the hostile surface, explorers could burrow underground and let the Moon's own geology do much of the protective work. The regolith—the loose rock and dust covering the lunar surface—would sit above them like a blanket, absorbing radiation and temperature extremes. It is an elegant solution to some of the hardest problems of lunar habitation.
Of course, building a home in a lunar pit presents its own formidable challenges. New technologies will need to be invented. Robots will need to be designed. Supply chains will need to be established. But the timeline is accelerating. NASA's Artemis II mission, scheduled for September 2025, will send astronauts to orbit the Moon aboard the Orion spacecraft. Then, in September 2026, Artemis III will land boots on the lunar surface for the first time since 1972. The agency has stated its intention to establish a permanent presence on the Moon—a foothold from which to eventually reach Mars. Those lava tubes, once mysterious shadows on orbital images, may soon become addresses.
Notable Quotes
The most probable explanation for our observations is an empty lava tube— Leonardo Carrer, assistant professor at the University of Trento
The Hearth Conversation Another angle on the story
Why does this particular discovery matter more than the others? We've known about these pits for over a decade.
Because knowing something exists and proving it are different things. For years, scientists could only guess. Now they have radar confirmation—they've actually seen inside. It changes the conversation from theoretical to practical.
And the temperature stability is the real prize here?
It's one of several. Yes, seventeen degrees Celsius is survivable without extreme heating or cooling systems. But equally important is the radiation shielding. The Sun's radiation at the Moon is brutal. Underground, you're protected by rock. That's not a luxury—it's essential.
How soon could astronauts actually use these tubes?
That's the open question. Artemis III lands in 2026, but that's a short visit. Building actual habitats underground requires technology we haven't invented yet. Excavation equipment, life support systems designed for cave environments, ways to seal and pressurize spaces. It's not impossible, but it's not imminent either.
So this is really a long-term play.
Exactly. This discovery is NASA saying: we have a blueprint for permanence. Not for the next five years, but for the decade after that. It's the difference between visiting and staying.