# Why Are We Going to Mars When the Moon Is So Close? The Surprising Science Behind Our Space Missions > The Moon is just days away, yet humanity dreams of reaching Mars. Why? Discover what scientists have found on the Moon, the secrets hidden in lunar ice, why Mars could hold clues to alien life, and why space agencies are exploring both worlds. - Published: 2026-10-28 - Updated: 2026-10-28 - Author: Keval - Section: Science Explained - Canonical: https://www.wonderunfold.com/blog/why-explore-mars-when-the-moon-is-closer - Markdown: https://www.wonderunfold.com/blog/why-explore-mars-when-the-moon-is-closer.md - Tags: Moon Exploration, Mars Exploration, NASA Artemis, Chandrayaan-3, Search for Alien Life, Space Science, Lunar Water, Solar System, Moon to Mars, Planetary Exploration, Space Missions, Astrobiology The Moon is just days away, yet humanity dreams of reaching Mars. Discover lunar ice, Chandrayaan-3 findings, and why both worlds matter. ## Key takeaways - The Moon is about 384,400 kilometres from Earth on average, while Mars is tens to hundreds of millions of kilometres away. - Apollo astronauts returned approximately 382 kilograms of lunar rocks and soil, but the missions explored only a limited number of sites. - Scientists have found evidence of water on the Moon, including ice in permanently shadowed polar regions and molecular water on sunlit surfaces. - India's Chandrayaan-3 mission confirmed sulphur and detected several other elements in the lunar south-polar region. - Mars preserves evidence of ancient rivers, deltas, and lake environments, making it an important target in the search for signs of past life. - NASA's Moon-to-Mars approach uses lunar exploration to develop experience and technologies that can support future human missions to Mars. - Scientists also investigate other destinations, including Europa and Enceladus, using robotic spacecraft. - There is no credible evidence that a secret discovery explains why scientists are interested in Mars; the two worlds serve different scientific purposes. Look up at the night sky. On a clear evening, you can see the Moon shining above you. It feels close enough to touch, at least compared with the unimaginable distances separating us from other planets. Now consider Mars. Depending on where Earth and Mars are in their orbits, the Red Planet can be tens or hundreds of millions of kilometres away. A crewed mission would involve months of travel, serious radiation risks, and a journey home that could take months more. So here is a perfectly reasonable question: why are scientists spending so much time planning journeys to Mars when the Moon is practically next door? Why not explore our closest neighbour first, understand everything about it, and only then move on? There is an even bigger mystery behind the question. Scientists have already explored the Moon, brought rocks back to Earth, mapped its surface, and discovered evidence of water. Yet many parts of it remain poorly understood. The answer is not that scientists have forgotten the Moon. In fact, NASA's Moon-to-Mars strategy treats lunar exploration as an important step towards eventually sending humans to Mars. The two destinations offer different scientific opportunities, and neither can completely replace the other. To understand why, we need to look at what we have discovered, what remains unknown, and what scientists hope to find on the next stage of humanity's journey into space. ## 1. First, Just How Close Is the Moon Compared With Mars? The Moon is approximately 384,400 kilometres from Earth on average. That sounds like an enormous distance, but spacecraft can reach it in roughly three days, depending on the mission and trajectory. Mars is in a completely different category. Its distance from Earth constantly changes because both planets orbit the Sun. At favourable alignments, the distance can fall to around 55 million kilometres, while at other times it exceeds 400 million kilometres. A robotic spacecraft travelling to Mars commonly takes several months to arrive. A human expedition would be much more complicated because it would need to support a crew for a long period, protect astronauts from radiation, and plan for a safe return. The difference is not simply about distance. The Moon is close enough that astronauts could potentially return to Earth in a matter of days. On Mars, an emergency evacuation would not be remotely so straightforward. Communication delays can also stretch from several minutes to more than 20 minutes one way, depending on the planets' positions. > info: **The distance changes everything.** The Moon is a nearby destination where we can practise living and working beyond Earth. Mars is a far more demanding expedition, requiring systems that can operate for long periods without immediate help from home. ![A space distance comparison showing Earth, the Moon nearby, and Mars much farther away.](https://www.wonderunfold.com/images/blog/earth-moon-mars-distance-comparison.jpg) *The enormous difference in distance means that a mission to Mars needs a very different level of preparation from a lunar mission.* ## 2. We Have Been to the Moon Before. What Did Scientists Actually Find? Humanity has not ignored the Moon. NASA's Apollo programme landed astronauts there six times between 1969 and 1972. Twelve astronauts walked on the lunar surface, collected rocks and soil, conducted experiments, and photographed a world that had previously been studied mostly from a distance. The astronauts returned approximately 382 kilograms of lunar material to Earth. Scientists have continued analysing these samples for decades, and modern instruments can extract information that was difficult or impossible to obtain when the rocks were first collected. But there is an important limitation: the Apollo astronauts visited only a handful of locations. They did not explore every region, every type of terrain, or the Moon's permanently shadowed polar craters. The Moon is a world, not a single landing site. Here are some of the most important discoveries. ### Discovery One: The Moon Preserves Clues to Earth's Violent Beginning One of the most important scientific insights from lunar samples concerns the Moon's origin. Evidence supports the idea that the young Earth experienced a gigantic collision with another planetary body, often called Theia. Material thrown into orbit eventually came together to form the Moon. This is not simply a story about how a beautiful object appeared in our sky. The Moon's composition helps scientists investigate the early history of Earth, the conditions under which rocky planets formed, and the violent collisions that shaped the young solar system. Earth has been constantly reshaped by erosion, weather, volcanic activity, and plate tectonics. The Moon has no comparable global system of plate tectonics or liquid-water erosion. Its ancient craters and rocks therefore preserve a different kind of record of the early solar system. In a sense, the Moon is a geological archive. Studying it helps scientists reconstruct events from an era whose evidence is much harder to find on Earth. ### Discovery Two: The Moon Has Water For a long time, the Moon was widely described as an extremely dry world. That picture changed as spacecraft observations and improved measurements revealed evidence of water and water-related molecules across the lunar surface. NASA missions, including Lunar Prospector and the Lunar Crater Observation and Sensing Satellite, strengthened the evidence for water ice in permanently shadowed polar regions. These are places where sunlight may never reach the crater floor and temperatures can remain extremely low. NASA's SOFIA observatory also detected molecular water on sunlit parts of the Moon in 2020. This is different from saying that the Moon has rivers, lakes, or an accessible underground ocean. Lunar water occurs in forms and locations that require careful investigation. Why does this matter? Water is essential for human life. If usable ice can be located and extracted, it might eventually provide drinking water, oxygen, or hydrogen and oxygen for rocket propellant after suitable processing. However, the existence of lunar water does not mean a ready-made supply is waiting to be collected. Scientists still need to determine its abundance, accessibility, distribution, and the practical difficulty of extracting it. ### Discovery Three: The Moon Is Made of More Than Just Grey Dust The Moon's surface contains a variety of rocks, minerals, and chemical elements. Its craters, volcanic plains, highlands, and impact basins reveal a complicated geological history. India's Chandrayaan-3 mission added an important chapter to this research. After its historic landing in the lunar south-polar region in August 2023, the Pragyan rover analysed nearby lunar soil. Its Laser-Induced Breakdown Spectroscopy instrument confirmed the presence of sulphur through direct measurements on the surface. The rover also detected elements including aluminium, calcium, iron, chromium, titanium, manganese, silicon, and oxygen through its instruments. In 2025, analysis of Chandrayaan-3 measurements provided further clues about the composition and possible origins of material at the landing site. Researchers reported unusual abundances of certain elements, including sulphur, that may help reveal the history of the region. These are valuable scientific findings. They do not mean scientists have found evidence of life, vegetation, or a hidden civilisation on the Moon. They tell us what the lunar surface is made of and help researchers reconstruct how it formed. ### Discovery Four: The Far Side Is Not the Same as the Dark Side The Moon rotates at almost the same rate that it orbits Earth. This synchronisation, known as tidal locking, means that the same hemisphere generally faces us. The far side is sometimes mistakenly called the dark side, as though sunlight never reaches it. That is not correct. Both hemispheres experience day and night. The far side is simply the side we cannot normally see directly from Earth. Spacecraft have mapped the far side, and robotic missions have explored parts of it. China's Chang'e-4 mission achieved the first soft landing on the lunar far side in 2019. Nevertheless, many locations remain scientifically interesting and difficult to explore. The far side also offers a special advantage for radio astronomy. The Moon itself can shield instruments there from much of Earth's radio interference, potentially allowing scientists to investigate faint radio signals from the early universe. The Moon is therefore not merely a destination for astronauts. It could also become a platform for observing the cosmos in ways that are difficult from Earth. ![Lunar surface, water ice in a permanently shadowed crater, and a small robotic rover studying rocks.](https://www.wonderunfold.com/images/blog/moon-discoveries-water-rocks-chandrayaan.jpg) *Lunar missions have revealed evidence of water, diverse minerals, and a geological record that stretches back billions of years.* ## 3. If We Have Already Visited the Moon, Why Do We Need to Go Back? The Apollo missions were extraordinary, but they did not finish lunar science. They explored a limited number of sites during a relatively short period. Modern instruments, new landing technologies, robotic systems, and better scientific questions have changed what researchers can investigate. Imagine studying Earth by visiting six small areas, collecting some rocks, and then leaving for half a century. You would learn a great deal, but you would still miss most of the planet's geological diversity, climate systems, ecosystems, and history. The Moon is not as complex as Earth, but the comparison illustrates why a few successful landings cannot answer every question. Modern lunar missions aim to study new regions, understand the distribution of water and other resources, improve our knowledge of the lunar interior, and investigate how the Moon and Earth evolved together. The lunar south pole is particularly interesting because some permanently shadowed craters may preserve ancient volatile materials. These deposits could help scientists understand how water reached the Moon and how resources might be used during future exploration. NASA's Artemis programme is intended to return astronauts to the lunar surface and develop a more sustained human and robotic presence. It is also designed to test capabilities relevant to more distant missions. Going back is therefore not about repeating the Apollo landings. It is about asking new questions, visiting new places, using better tools, and learning how to operate beyond Earth for longer periods. > tip: **The part we often overlook.** The Apollo missions landed astronauts at six locations. They did not explore the entire Moon, and scientists are still studying the samples they brought home. ## 4. So Why Is Mars Such a Big Deal? If the Moon is the nearby laboratory, Mars is one of the most compelling places to investigate whether life might have emerged beyond Earth. Mars is cold, dry, and covered by a thin atmosphere today. But spacecraft have found geological evidence that its ancient environment was very different. There are dried-up river channels, deltas, lake deposits, and minerals that formed in the presence of liquid water. Billions of years ago, some Martian environments may have offered conditions suitable for microbial life. That does not mean life definitely existed there. It means the planet preserves places where scientists can search for clues. This is a crucial distinction. Finding evidence that a world could support life is not the same as discovering life itself. NASA's rovers have investigated ancient Martian environments, analysed rocks, and searched for chemical and geological signs that could help scientists understand whether Mars was once habitable. The Perseverance rover has also collected rock-core samples intended for possible future return to Earth through a sample-return effort whose plans and schedule have been subject to change. If scientists eventually identify convincing evidence of ancient Martian life, it would transform our understanding of biology. It could suggest that life can emerge in more than one place, given suitable conditions. If no evidence is found, that result would also matter, although it would not prove that life never existed anywhere on Mars. Mars offers something the Moon does not: a geological history that includes evidence of ancient surface water and potentially habitable environments. That makes it an especially attractive target in the search for life beyond Earth. ![A robotic rover examining an ancient river delta on Mars beneath a dusty red sky.](https://www.wonderunfold.com/images/blog/ancient-mars-river-delta-rover.jpg) *Mars preserves evidence of ancient rivers and lake environments, making it a major target in the search for signs of past life.* ## 5. Moon vs Mars: Which Is More Important? There is no universal winner because the Moon and Mars help answer different questions. The best destination depends on the scientific objective. If we want to understand the Earth-Moon system, study ancient impact history, investigate lunar ice, or test technologies for working on another world's surface, the Moon offers major advantages. If we want to investigate whether another planet once had environments suitable for life, Mars is a particularly strong candidate. Its ancient geological record offers clues that the Moon cannot provide in the same way. The Moon is easier to reach and is a more practical place to test systems that need maintenance, resupply, and human supervision. Mars demands longer periods of independence, more extensive life-support systems, and much more complicated emergency planning. The choice is not Moon or Mars. A sensible exploration strategy can use each world to answer its own questions while building knowledge and technology for the next destination. | Feature | Moon | Mars | | --- | --- | --- | | Average distance from Earth | About 384,400 km | About 225 million km, varying greatly | | Typical travel time | Around 3 days for many crewed lunar trajectories | Several months for robotic spacecraft; human mission designs vary | | Atmosphere | Extremely thin exosphere | Thin atmosphere, mostly carbon dioxide | | Water | Evidence of water molecules and ice, especially in permanently shadowed polar regions | Water ice exists; ancient rivers, deltas, and lake environments are recorded in the landscape | | Search for past life | Not a leading direct target for finding life that evolved on the Moon; lunar material can help investigate Earth's history | Major target because some ancient environments may have been habitable | | Main human-exploration advantage | Nearby destination for testing technologies and learning to operate on a planetary surface | A more challenging destination for studying another planet and investigating its potential biological history | | Major challenge | Radiation, extreme temperature changes, dust, and difficult resource extraction | Radiation, long travel, communication delays, dust, a hostile environment, and difficult return logistics | *A practical comparison of the Moon and Mars* ## 6. Why Not Send Humans to Every Planet Instead? Our solar system contains eight recognised planets, numerous dwarf planets, hundreds of moons, asteroids, and comets. It is natural to ask why we concentrate so much attention on the Moon and Mars rather than sending astronauts everywhere. The short answer is that distance, temperature, radiation, atmospheric conditions, gravity, and travel time make destinations dramatically different from one another. Mercury is extremely close to the Sun and experiences severe temperature extremes. Venus has crushing atmospheric pressure and surface temperatures hot enough to melt lead. Jupiter and Saturn are giant planets without solid surfaces like Earth's, although some of their moons may be compelling targets for future exploration. Uranus and Neptune are extraordinarily distant. A crewed expedition to those regions would require travel times and mission systems far beyond what is currently practical for human exploration. Some of the most exciting places to search for environments that might support life are not planets at all. Jupiter's moon Europa and Saturn's moon Enceladus are thought to harbour subsurface oceans beneath icy crusts. These worlds are important targets for robotic science missions, even though landing humans there is far more difficult than sending spacecraft. Scientists are not simply choosing the most famous destinations. They weigh scientific value against engineering difficulty, cost, mission duration, and the risks to human life. Robotic spacecraft can travel where humans cannot yet go. They have explored the surfaces of planets, studied comets, flown past distant worlds, and investigated the atmospheres of giant planets. Human exploration and robotic exploration are complementary approaches, not competing ones. ![A scientifically inspired montage of Mercury, Venus, the Moon, Mars, Europa, Enceladus, and distant planets.](https://www.wonderunfold.com/images/blog/solar-system-exploration-destinations.jpg) *The solar system contains many compelling destinations, but each requires different technology and offers different scientific opportunities.* ## 7. The Real Reason We Are Going to the Moon Before Mars A crewed mission to Mars is not simply a longer version of a trip to the Moon. The challenges grow in ways that affect almost every part of the mission. On the Moon, astronauts are only days from Earth. If a mission encounters a serious problem, a return journey is difficult but far more manageable than an emergency evacuation from Mars. On Mars, crews may need to spend many months travelling each way. Mission planners must account for food, water, oxygen, radiation protection, equipment failures, medical emergencies, and the possibility that a return window may not arrive when needed. Communication also becomes more difficult. Commands and messages cannot travel faster than light, so there can be a substantial delay between an astronaut's action and a response from Earth. Mars crews would need greater autonomy and the ability to solve problems without waiting for mission control. This is why NASA describes lunar exploration as a way to develop and test capabilities for more distant missions. The Moon provides an opportunity to learn about surface operations, life-support systems, mobility, resource use, power generation, and the reliability of equipment in a harsh environment. The Moon cannot perfectly reproduce Mars. The two worlds have different gravity, geology, atmospheres, and environmental conditions. But it can help scientists and engineers discover which systems work, which fail, and which need redesigning before a much longer expedition. Think of it as learning to sail in challenging coastal waters before attempting a crossing of an entire ocean. The experience does not remove every danger, but it can reveal weaknesses before the stakes become much higher. > tip: **Moon first does not mean Mars never.** Lunar exploration can reduce some of the risks of future Mars missions. It cannot eliminate them, and Mars will still require technologies and experience that cannot be fully tested on the Moon. ## 8. What Have We Not Discovered Yet? Despite decades of exploration, the Moon still contains major scientific unknowns. Scientists do not have a complete picture of its deep interior, the distribution and accessibility of polar ice, or every detail of its formation and evolution. We need more measurements from different regions to understand how the lunar interior varies. Additional seismic instruments could help scientists better constrain the Moon's internal structure. More samples from carefully selected locations could reveal geological materials that the Apollo missions never collected. The history of lunar water also remains an active research area. Scientists want to understand where it came from, how it moves across the surface, and how much is available in places where future missions might operate. The far side could support radio astronomy experiments that benefit from shielding against terrestrial radio interference. Such observations may eventually provide new ways to investigate faint signals from the early universe. And there is a wider scientific opportunity: lunar rocks and craters preserve evidence of impacts that affected the early solar system. Studying these records helps researchers understand the environment in which Earth and the other rocky planets developed. Mars has its own unresolved mysteries. Did microbial life ever emerge there? How long did potentially habitable environments last? Where did much of its atmosphere and surface water go? What can its rocks reveal about the transition from a wetter world to the cold desert we see today? These questions show why space exploration is not a race with one destination at the finish line. Each world provides a different piece of a much larger puzzle. ## 9. Is There a Secret Reason Scientists Prefer Mars? The idea that scientists have stopped studying the Moon because they are hiding something is not supported by the available evidence. There is a much more straightforward explanation: different missions are designed to answer different scientific questions. The Moon is important for understanding planetary formation, ancient impacts, lunar resources, and the practical challenges of working beyond Earth. Mars is particularly valuable for investigating the history of water and searching for possible signs of ancient life. There are also strategic, economic, and political factors behind space programmes. Governments invest in exploration to develop technology, support scientific research, inspire public interest, build partnerships, and maintain expertise. These factors can influence which missions receive funding and when they happen. It is fair to question priorities and ask whether space budgets are being used wisely. But we should distinguish documented mission goals from speculation about secret discoveries. The scientific evidence already makes the Moon fascinating. We do not need an unverified conspiracy to explain why it deserves further exploration. ## 10. The Bigger Question: Why Explore Space at All? There is a practical answer: space research helps us understand the origins of planets, test new technologies, study environments beyond Earth, and investigate whether life exists elsewhere. There is also a deeper answer. Earth is the only world currently known to support life, but we do not yet understand how common life might be in the universe. Studying Mars, icy moons, and other potentially habitable environments helps us investigate whether the processes that produced life here can happen elsewhere. The Moon can help reveal how our own planet formed. Mars can help us study how a once-wetter world changed over time. Icy moons may offer environments unlike anything on Earth's surface. Telescopes studying distant planets may eventually tell us about worlds around other stars. Each destination contributes a different kind of evidence. None can answer every question alone. There is no guarantee that exploring Mars will reveal alien life, or that building a long-term presence on the Moon will be easy. Space missions are expensive, risky, and often produce results that differ from what scientists expected. But exploration is not valuable only when it delivers a dramatic discovery. Sometimes the greatest achievement is ruling out an idea, identifying a new question, or building a tool that makes a future breakthrough possible. ## The Final Answer: We Are Not Choosing Mars Instead of the Moon The Moon is close, but it is not fully understood. Its ancient rocks preserve clues to the early solar system, its polar regions contain evidence of water ice, and its surface offers a challenging environment in which to test technologies for living beyond Earth. Mars is far away, but it offers a different opportunity. Its ancient rivers, deltas, and lake deposits suggest that parts of the planet may once have been habitable. That makes it one of our most important targets in the search for evidence of life beyond Earth. We explore the Moon because it can teach us about our origins and help us prepare for deeper journeys. We explore Mars because it may help answer whether life ever emerged on another planet. We study distant moons and other worlds because the universe is much bigger than the places humans can currently reach. So the next time you see the Moon, remember this: the world hanging above your head is not an abandoned destination or a mystery that has been solved. It is one of the most accessible laboratories in space, and we are still learning how much it can teach us. Mars may be the next giant leap. But the Moon is far from yesterday's news. Continue with does the universe have an edge, how big the universe is, and what if Earth were alone. --- ## Frequently Asked Questions ## Moon vs Mars FAQ ### Why are scientists going to Mars when the Moon is much closer? The Moon and Mars offer different scientific opportunities. The Moon helps scientists study the early Earth-Moon system, investigate lunar resources, and test technologies for future exploration. Mars preserves evidence of ancient water and potentially habitable environments, making it a major target in the search for signs of past life. ### What have scientists discovered on the Moon? Lunar missions have studied ancient impact craters, volcanic rocks, minerals, the Moon's geological history, and evidence of water. Apollo astronauts returned about 382 kilograms of lunar samples. Chandrayaan-3 also measured elements including sulphur in the lunar south-polar region. ### Has water been found on the Moon? Yes. Multiple missions have found evidence of water on the Moon, including water ice in permanently shadowed polar regions. NASA's SOFIA observatory also detected molecular water on sunlit lunar surfaces. The amount, distribution, and accessibility of usable water remain important research questions. ### Has India discovered anything on the Moon? Yes. India's Chandrayaan-3 mission landed in the lunar south-polar region in August 2023. Its Pragyan rover confirmed sulphur through direct surface measurements and detected several other elements. These measurements help scientists understand lunar soil and the region's geological history. ### Have humans walked on Mars? No. Robotic spacecraft and rovers have explored Mars, but no human has visited the planet. Crewed missions would require much longer travel, robust life-support systems, radiation protection, and plans for emergencies and return journeys. ### Have scientists found life on Mars? No confirmed evidence of life on Mars has been announced. Scientists have found geological evidence that parts of Mars once had liquid water and potentially habitable environments. Missions continue to investigate whether signs of ancient microbial life are preserved in Martian rocks. ### Why did humans stop going to the Moon after 1972? The last crewed lunar landing was Apollo 17 in December 1972. The end of the Apollo landings reflected political priorities, budget decisions, and changing programme goals. Robotic missions continued exploring the Moon, and new international efforts are now working towards renewed human exploration. ### Why don't we send astronauts to every planet? Human missions are limited by travel time, cost, radiation, temperature, atmospheric pressure, gravity, and the difficulty of keeping crews alive. Robotic missions can explore many destinations that are currently impractical or unsafe for humans, including distant planets and icy moons. ### Could the Moon become a base for future space missions? A sustained lunar presence is one goal of current exploration planning. Lunar bases or surface infrastructure could eventually support research and test technologies for longer missions. However, building and maintaining such infrastructure would require overcoming major challenges involving radiation, dust, temperature extremes, power, and resource extraction. ### Is Mars more important than the Moon? Neither is universally more important. The Moon is especially useful for studying the history of the Earth-Moon system and developing exploration capabilities. Mars is particularly valuable for studying ancient planetary environments and searching for possible evidence of past life. **What this comparison clarifies — and what remains open** **What this can establish** - Separates lunar science goals from the search for past life on Mars. - Explains why Moon-to-Mars is a capability strategy, not a replacement for Martian science. - Distinguishes confirmed lunar water evidence from an easily usable water supply. **What this cannot establish** - No confirmed evidence of life on Mars has been announced. - Usable lunar ice abundance and extraction remain active research questions. - Crewed Mars missions remain far more demanding than lunar exploration. ## FAQ ### Why are scientists going to Mars when the Moon is much closer? The Moon and Mars offer different scientific opportunities. The Moon helps scientists study the early Earth-Moon system, investigate lunar resources, and test technologies for future exploration. Mars preserves evidence of ancient water and potentially habitable environments, making it a major target in the search for signs of past life. ### What have scientists discovered on the Moon? Lunar missions have studied ancient impact craters, volcanic rocks, minerals, the Moon's geological history, and evidence of water. Apollo astronauts returned about 382 kilograms of lunar samples. Chandrayaan-3 also measured elements including sulphur in the lunar south-polar region. ### Has water been found on the Moon? Yes. Multiple missions have found evidence of water on the Moon, including water ice in permanently shadowed polar regions. NASA's SOFIA observatory also detected molecular water on sunlit lunar surfaces. The amount, distribution, and accessibility of usable water remain important research questions. ### Has India discovered anything on the Moon? Yes. India's Chandrayaan-3 mission landed in the lunar south-polar region in August 2023. Its Pragyan rover confirmed sulphur through direct surface measurements and detected several other elements. These measurements help scientists understand lunar soil and the region's geological history. ### Have humans walked on Mars? No. Robotic spacecraft and rovers have explored Mars, but no human has visited the planet. Crewed missions would require much longer travel, robust life-support systems, radiation protection, and plans for emergencies and return journeys. ### Have scientists found life on Mars? No confirmed evidence of life on Mars has been announced. Scientists have found geological evidence that parts of Mars once had liquid water and potentially habitable environments. Missions continue to investigate whether signs of ancient microbial life are preserved in Martian rocks. ### Why did humans stop going to the Moon after 1972? The last crewed lunar landing was Apollo 17 in December 1972. The end of the Apollo landings reflected political priorities, budget decisions, and changing programme goals. Robotic missions continued exploring the Moon, and new international efforts are now working towards renewed human exploration. ### Why don't we send astronauts to every planet? Human missions are limited by travel time, cost, radiation, temperature, atmospheric pressure, gravity, and the difficulty of keeping crews alive. Robotic missions can explore many destinations that are currently impractical or unsafe for humans, including distant planets and icy moons. ### Could the Moon become a base for future space missions? A sustained lunar presence is one goal of current exploration planning. Lunar bases or surface infrastructure could eventually support research and test technologies for longer missions. However, building and maintaining such infrastructure would require overcoming major challenges involving radiation, dust, temperature extremes, power, and resource extraction. ### Is Mars more important than the Moon? Neither is universally more important. The Moon is especially useful for studying the history of the Earth-Moon system and developing exploration capabilities. Mars is particularly valuable for studying ancient planetary environments and searching for possible evidence of past life. ## Sources 1. [Why Moon and Mars? Building an Evolutionary Architecture](https://www.nasa.gov/wp-content/uploads/2025/12/acr25-wp-why-moon-and-mars-v2.pdf?emrc=ad809c) — NASA 2. [Moon Water and Ices](https://science.nasa.gov/moon/moon-water-and-ices/) — NASA Science 3. [Moon Facts](https://science.nasa.gov/moon/facts/) — NASA Science 4. [Moon Exploration](https://science.nasa.gov/moon/exploration/) — NASA Science 5. [Lunar Discovery and Exploration Priorities](https://science.nasa.gov/lunar-science/priorities/) — NASA Science 6. [LIBS Confirms the Presence of Sulphur on the Lunar Surface](https://www.isro.gov.in/ISRO_EN/LIBSResults.html) — Indian Space Research Organisation 7. [Primitive Mantle Material Revealed by Chandrayaan-3 APXS Volatile Measurements](https://www.isro.gov.in/Ch3_APXS_volatile_measurements.html) — Indian Space Research Organisation 8. [Mars Facts](https://science.nasa.gov/mars/facts/) — NASA Science 9. [Mars Science Objectives](https://science.nasa.gov/planetary-science/programs/mars-exploration/mars-science-objectives/) — NASA Science 10. [Why the Moon?](https://www.asc-csa.gc.ca/eng/youth-educators/why-the-moon.asp) — Canadian Space Agency --- Source: [Why Are We Going to Mars When the Moon Is So Close? The Surprising Science Behind Our Space Missions](https://www.wonderunfold.com/blog/why-explore-mars-when-the-moon-is-closer). Written and edited by humans for WonderUnfold.