Planetary Observer program
Two projects were conceived by NASA's Solar System Exploration Committee in 1983, the Planetary Observer program and Mariner Mark II.The Mariner Mark II, on the other hand, was to be a series of large spacecraft for the exploration of the outer Solar System.The first of the proposed Observer series of planetary missions, it was launched by NASA on September 25, 1992.The Lunar Observer program was started with an estimated budget of US$500–700 million.The Lunar Observer spacecraft garnered some attention from the Soviet Union, and there was a suggestion that they might cooperate with NASA to field some instruments for it.
Mars Observerspace explorationMariner Mark IIgeoscienceJupiterplanetary explorationLarge strategic science missionsLunar Discovery & ExplorationMars ExplorationPlanetary MissionsDiscoveryNew FrontiersOcean Worlds ExplorationVoyagerLunar OrbiterLunar PrecursorMarinerNew MillenniumPioneerRangerSurveyorVikingGrand TourProject PrometheusVoyager (Mars)List of NASA missionsPolicycreationNational Aeronautics and Space ActSpace Task GroupRogersSpace Exploration InitiativeAugustineCFUSAIVision for Space ExplorationAldridgeSpace RaceAdministrator and Deputy AdministratorChief ScientistAstronaut CorpsRanks and positionsBudgetNASA researchspinoff technologiesNASA TVNASA SocialLaunch Services ProgramMercury Control CenterManned Space Flight NetworkKennedy Space CenterVehicle Assembly BuildingLaunch Complex 39Launch Complex 48Launch Control CenterOperations and Checkout BuildingJohnson Space CenterMission ControlLunar Sample LaboratoryScience Mission DirectorateHuman spaceflightsuborbitalMercuryGeminiApolloSkylabApollo–SoyuzSoviet space programSpace ShuttleShuttle–MirRoscosmosConstellationInternational Space StationCommercial Orbital Transportation ServicesCommercial CrewArtemisLunar GatewayRoboticHitchhikerMars Surveyor '98Mars Exploration RoverLiving With a StarLunar Precursor Robotic ProgramEarth Observing SystemGreat Observatories programExplorersSolar Terrestrial ProbesCommercial Lunar Payload ServicesSIMPLExmissionsApollo 11Mercury 3Mercury-Atlas 6MagellanPioneer 10Pioneer 11GalileotimelineSpitzer Space TelescopeSojourner roverSpirit roverMESSENGERAquariusCassiniKepler space telescopeOpportunity roverobservedRHESSIInSightIngenuity helicopterflightsMars Reconnaissance Orbiter2001 Mars OdysseyNew HorizonsHubble Space TelescopeTHEMISCuriosity roverGOES 14Lunar Reconnaissance OrbiterGOES 15Van Allen ProbesSolar Dynamics ObservatoryMars Science LaboratoryNuSTARVoyager 1Voyager 2OSIRIS-REx