Explore Mars In DepthScienceMars Science Laboratory (MSL)Mariner 9 View of Nirgal...Mars HomeFactsMars ExplorationOverviewRover BasicsMars Exploration Science GoalsMission Timeline SummaryMars MissionsMars Sample ReturnMars Perseverance RoverMars Curiosity RoverMAVENMars Reconnaissance OrbiterMars OdysseyMars Relay NetworkMore Mars MissionsMultimediaImagesVideoAudioMore ResourcesNews & FeaturesLatest Mars ArticlesThe Mars ReportNewsletter HomeMoreThe Solar System Mariner 9 View of Nirgal VallisNovember 21, 2011 This view of channels on Mars came from NASA's Mariner 9 orbiter. In 1971, Mariner 9 became the first spacecraft to enter orbit around Mars. Downloads Original (958×605) Mar 11, 2024 JPEG (424.59 KB)