マーズ・グローバル・サーベイヤー
When MRO entered orbit, it joined five other active spacecraft that were either in orbit or on the planet's surface: "Mars Global Surveyor", "Mars Express", "2001 Mars Odyssey", and the two Mars Exploration Rovers ("Spirit" and "Opportunity"). This set a new record for the most operational spacecraft in the immediate vicinity of Mars. "Mars Global Surveyor" and the rovers "Spirit" and "Opportunity" have since ceased to function. , "2001 Mars Odyssey", "Mars Express" and MRO remain operational and have been joined by "Mars Orbiter Mission", "MAVEN" and "ExoMars Trace Gas Orbiter", the Emirates "Hope" orbiter and the Chinese "Tianwen-1" orbiter in orbit, and "Curiosity, Perseverance", "InSight" and "Zhurong" on the surface, raising the record to twelve active spacecraft.