| 
                                    
                                        gptkbp:instanceOf
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:satellite
                                        
                                         
                                    
                                        
                                            gptkb:NASA_space_science_missions
                                        
                                         
                                    
                                        
                                            gptkb:robotic_spacecraft
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:actualMissionDuration
                                    
                                 | 
                                
                                    
                                        
                                            
                                            2210 sols
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:builtBy
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Jet_Propulsion_Laboratory
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:communicationLost
                                    
                                 | 
                                
                                    
                                        
                                            
                                            2010-03-22
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:discoveredBy
                                    
                                 | 
                                
                                    
                                        
                                            
                                            evidence of past water activity
                                        
                                        
                                         
                                    
                                        
                                            
                                            silica-rich soil
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:distance
                                    
                                 | 
                                
                                    
                                        
                                            
                                            7.73 km
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:duration
                                    
                                 | 
                                
                                    
                                        
                                            
                                            90 sols
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:endDate
                                    
                                 | 
                                
                                    
                                        
                                            
                                            2010-03-22
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:goal
                                    
                                 | 
                                
                                    
                                        
                                            
                                            search for signs of past life
                                        
                                        
                                         
                                    
                                        
                                            
                                            search for evidence of water activity
                                        
                                        
                                         
                                    
                                        
                                            
                                            study Martian atmosphere
                                        
                                        
                                         
                                    
                                        
                                            
                                            analyze Martian geology
                                        
                                        
                                         
                                    
                                        
                                            
                                            determine distribution and composition of minerals
                                        
                                        
                                         
                                    
                                        
                                            
                                            search for and characterize rocks and soils
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:height
                                    
                                 | 
                                
                                    
                                        
                                            
                                            1.5 m
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:instrument
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Alpha_Particle_X-ray_Spectrometer_(APXS)
                                        
                                         
                                    
                                        
                                            gptkb:Mössbauer_Spectrometer
                                        
                                         
                                    
                                        
                                            gptkb:Microscopic_Imager
                                        
                                         
                                    
                                        
                                            gptkb:Miniature_Thermal_Emission_Spectrometer_(Mini-TES)
                                        
                                         
                                    
                                        
                                            gptkb:Rock_Abrasion_Tool_(RAT)
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:landingDate
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Gusev_Crater
                                        
                                         
                                    
                                        
                                            
                                            2004-01-04
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:lastContact
                                    
                                 | 
                                
                                    
                                        
                                            
                                            2010-03-22
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:launchDate
                                    
                                 | 
                                
                                    
                                        
                                            
                                            2003-06-10
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:launchSite
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Cape_Canaveral_SLC-17A
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:launchVehicle
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Delta_II_7925
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:length
                                    
                                 | 
                                
                                    
                                        
                                            
                                            1.6 m
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:mass
                                    
                                 | 
                                
                                    
                                        
                                            
                                            185 kg
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:missionType
                                    
                                 | 
                                
                                    
                                        
                                            
                                            Mars exploration
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:nickname
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:MER-A
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:notableEvent
                                    
                                 | 
                                
                                    
                                        
                                            
                                            became stuck in sand in 2009
                                        
                                        
                                         
                                    
                                        
                                            
                                            exceeded planned mission duration by over 20 times
                                        
                                        
                                         
                                    
                                        
                                            
                                            operated for over 6 years
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:notableProject
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:John_Callas
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:operatedBy
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:NASA
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:partOf
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Mars_Exploration_Rover_program
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:photo
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Navigation_Camera_(Navcam)
                                        
                                         
                                    
                                        
                                            gptkb:Panoramic_Camera_(Pancam)
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:powerSource
                                    
                                 | 
                                
                                    
                                        
                                            
                                            solar panels
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:projectScientist
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Steve_Squyres
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:status
                                    
                                 | 
                                
                                    
                                        
                                            
                                            mission complete
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:twinRover
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Opportunity_rover
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:website
                                    
                                 | 
                                
                                    
                                        
                                            
                                            https://mars.nasa.gov/mer/
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:width
                                    
                                 | 
                                
                                    
                                        
                                            
                                            2.3 m
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:bfsParent
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Deep_Space_Network
                                        
                                         
                                    
                                        
                                            gptkb:NASA_Jet_Propulsion_Laboratory
                                        
                                         
                                    
                                        
                                            gptkb:VxWorks
                                        
                                         
                                    
                                        
                                            gptkb:Rocker-bogie_suspension
                                        
                                         
                                    
                                        
                                            gptkb:Curiosity_rover
                                        
                                         
                                    
                                        
                                            gptkb:Mars_Exploration_Program
                                        
                                         
                                    
                                        
                                            gptkb:NASA_Curiosity_rover_program
                                        
                                         
                                    
                                        
                                            gptkb:NASA_Opportunity_rover_program
                                        
                                         
                                    
                                        
                                            gptkb:NASA_Spirit_rover_program
                                        
                                         
                                    
                                        
                                            gptkb:Columbia_Hills
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:bfsLayer
                                    
                                 | 
                                
                                    
                                        
                                            
                                            6
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        https://www.w3.org/2000/01/rdf-schema#label
                                    
                                 | 
                                
                                    
                                        
                                            
                                            Spirit rover
                                        
                                        
                                         
                                    
                                 |