Mars exploration has progressed from orbiters and the first successful landings to rovers that travel across the surface and collect samples for possible return. These 10 facts trace that history—and distinguish what missions have found from what remains unknown.
Top 10 facts about missions to Mars
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Viking 1 made the first successful U.S. landing on Mars
NASA’s Viking 1 lander touched down in Chryse Planitia on July 20, 1976. Viking 2 landed at Utopia Planitia on September 3, 1976. NASA describes Viking as its first mission designed to search for signs of life on Mars. NASA’s Viking mission overview.
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Viking studied Mars from orbit and from the surface
Each Viking spacecraft consisted of an orbiter and a lander. The orbiter surveyed Mars from above before releasing the lander, giving the mission both a broad view of the planet and measurements from the surface. That combination illustrates why Mars missions use different platforms: orbiters observe the planet and can support communications, while landers and rovers investigate particular sites. NASA’s Viking mission overview.
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Viking’s experiments did not confirm life
Viking’s life-detection experiments found no traces of life, although the mission detected elements essential to life as known on Earth. Those results describe what the experiments found at their landing sites; they do not prove that Mars never supported life. NASA’s Viking science summary.
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Pathfinder delivered Mars’s first robotic rover
NASA’s Mars Pathfinder landed on July 4, 1997, and deployed Sojourner, the first robotic rover to operate on Mars. Pathfinder also demonstrated an airbag-assisted landing approach, in which airbags helped cushion the spacecraft’s impact with the surface. NASA’s Pathfinder mission overview; NASA’s Mars Pathfinder mission page.
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Getting a spacecraft onto Mars requires a tightly timed landing sequence
Mars’s thin atmosphere makes landing a challenge: a spacecraft must slow down and reach the surface through a sequence involving atmospheric entry, parachutes, rockets, and landing systems. NASA calls this entry, descent, and landing phase “seven minutes of terror” because critical events must succeed in rapid succession. NASA’s Perseverance landing overview.
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Spirit and Opportunity investigated evidence of past water
NASA’s twin rovers landed at separate sites in January 2004. They examined rocks and soils at locations chosen for signs of past water activity, helping scientists investigate how water had shaped the Martian surface. Evidence of past water can inform questions about whether environments may once have been habitable; it is not, by itself, evidence that life existed. NASA’s Mars Exploration Rover mission page.
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Opportunity operated for nearly 15 years and traveled more than 28 miles
NASA reports that Opportunity operated for nearly 15 years and traveled more than 28 miles (45 kilometers), far beyond its short planned primary mission. Communication ceased after a global dust storm in 2018. NASA’s Mars Exploration Rover mission page.
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Mars exploration involves multiple space agencies
NASA is not the only agency exploring Mars. The European Space Agency’s ExoMars program includes the Trace Gas Orbiter, which studies the Martian atmosphere, and the Rosalind Franklin rover. NASA’s Mars program overview lists the rover’s launch as no earlier than 2028; that is a forward-looking date, not a guarantee. NASA’s Mars exploration overview.
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Perseverance is caching samples for possible future return
NASA’s Perseverance rover collects Martian rock and soil samples and seals selected material in tubes for potential retrieval by a future mission. Perseverance itself is not bringing those samples back to Earth. As of October 4, 2026, the available official material cited here does not establish a settled sample-return schedule or a final return architecture. NASA’s Mars Sample Return overview; NASA’s Perseverance mission page.
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MAVEN’s status changed in 2026
NASA declared the MAVEN mission ended on June 3, 2026, after the spacecraft lost contact on December 6, 2025, and was found to be unrecoverable. Before contact was lost, MAVEN studied Mars’s upper atmosphere and contributed to communications relay operations for surface missions. It should not be described as an operating Mars orbiter based on that end-of-mission notice. NASA’s MAVEN end-of-mission notice; NASA’s MAVEN mission page.
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How Mars missions work together
Orbiters map and study Mars from above; stationary landers make measurements at one site; rovers move between rocks and soil to investigate local geology. Orbiters can also relay data between surface spacecraft and Earth. Together, those roles let missions address different questions—from the planet’s atmosphere and climate to the history of water and the character of individual samples. NASA’s Mars exploration overview.
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