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Mars is the fourth planet from the Sun, and the seventh largest. It’s the only planet we know of inhabited entirely by robots.

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Mars - NASA Science Skip to main content Missions Search All NASA MissionsA to Z List of MissionsUpcoming Launches and LandingsSpaceships and RocketsCommunicating with MissionsArtemisJames Webb Space TelescopeHubble Space TelescopeInternational Space StationOSIRIS-RExHumans in Space Why Go to SpaceAstronautsCommercial SpaceDestinationsSpaceships and RocketsLiving in SpaceEarth & Climate Explore Earth ScienceClimate ChangeEarth, Our PlanetEarth Science in ActionEarth MultimediaEarth DataEarth Science ResearchersAbout NASA NASA's ImpactsCenters and FacilitiesDirectoratesOrganizationsPeople of NASACareersInternshipsOur HistoryDoing Business with NASAGet InvolvedContactLearning Resources For Kids and StudentsFor EducatorsFor Colleges and UniversitiesFor ProfessionalsScience for EveryoneRequest an Exhibit or SpeakerSTEM Engagement at NASAAeronautics Science in the AirNASA AircraftFlight InnovationSupersonic FlightAir Traffic SolutionsGreen Aviation TechDrones & YouTechnology Technology Transfer & SpinoffsSpace Travel TechnologyTechnology Living in SpaceManufacturing and MaterialsRoboticsScience InstrumentsComputingThe Universe ExoplanetsThe Search for Life in the UniverseStarsGalaxiesBlack HolesThe Big BangDark Matter & Dark EnergyThe Solar System The SunMercuryVenusEarthThe MoonMarsJupiterSaturnUranusNeptunePluto & Dwarf PlanetsAsteroids, Comets & MeteorsThe Kuiper BeltThe Oort CloudSkywatchingEspañol CienciaAeronáuticaCiencias TerrestresSistema SolarUniversoScience All NASA ScienceEarth SciencePlanetary ScienceAstrophysics & Space ScienceThe Sun & HeliophysicsBiological & Physical SciencesLunar ScienceCitizen ScienceAstromaterialsAeronautics ResearchHuman Space Travel ResearchSearchNASA+HomeMarsMars HomeFactsOverviewRover BasicsMars Exploration Science GoalsMission Timeline SummaryMars Sample ReturnMars Perseverance RoverMars Curiosity RoverMAVENMars Reconnaissance OrbiterMars OdysseyMore Mars MissionsThe Mars ReportImagesVideoAudioMore ResourcesNews & FeaturesThe SunMercuryVenusEarthThe MoonMarsJupiterSaturnUranusNeptunePluto & Dwarf PlanetsAsteroids, Comets & MeteorsThe Kuiper BeltThe Oort CloudMars HomeFactsNews & FeaturesMarsMars is the fourth planet from the Sun, and the seventh largest. It’s the only planet we know of inhabited entirely by robots.Mission Status03NASA Spacecraft in Orbit02NASA Rovers on the SurfaceFeatured TopicsRead More Mars StoriesScientists Re-Create Mars ‘Spiders’ in a Lab for First TimeThe spiders are strange, beautiful geologic features in their own right.Perseverance Begins Long Climb Up Martian Crater RimAfter 2½ years exploring Jezero Crater, the rover will ascend to an area where it will search for more discoveries that could rewrite Mars’ history.How Curiosity’s Sky Crane Changed the Way NASA Explores MarsTwelve years ago, NASA landed its six-wheeled science lab using a daring new technology.A Fascinating Mars RockThe most puzzling, complex, and potentially important rock yet investigated by Perseverance.What is a Potential Biosignature?Scientist Lindsay Hays explains what defines potential signs of ancient life on other worldsMars OverviewMars is no place for the faint-hearted. It’s dry, rocky, and bitter cold. The fourth planet from the Sun, Mars, is one of Earth's two closest planetary neighbors (Venus is the other). Mars is one of the easiest planets to spot in the night sky – it looks like a bright red point of light.Despite being inhospitable to humans, robotic explorers – like NASA's Perseverance rover – are serving as pathfinders to eventually get humans to the surface of the Red Planet.More Mars FactsFeatured VideoThe Mars ReportNo WiFi? No problem for the Mars Curiosity rover.Download the VideoWhy Do We Go?Mars is one of the most explored bodies in our solar system, and it's the only planet where we've sent rovers to explore the alien landscape. NASA missions have found lots of evidence that Mars was much wetter and warmer, with a thicker atmosphere, billions of years ago.Explore with UsEarth-Mars Comparison: This composite image, from NASA Galileo and Mars Global Survey orbiters, of Earth and Mars was created to allow viewers to gain a better understanding of the relative sizes of the two planets.JPLMars Relay Network: Interplanetary InternetUnable to render the provided sourceMars Relay Network is the first link in a two-way communications bridge from Mars to EarthNASA/JPL-Caltech/VTADRead More About the Interplanetary InternetHow We ExploreMars Sample ReturnNASA and ESA (European Space Agency) are planning ways to bring the first samples of Mars material back to Earth for detailed study. Mars Perseverance Rover (Mars 2020)The Mars 2020 mission Perseverance rover is the first step of a proposed roundtrip journey to return Mars samples to Earth.Mars Curiosity Rover (Mar

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