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Purpose: Earth observation for monitoring natural and man-made changes to Earth's surface. Key Features: Carries two key sensors - OLI and TIRS, can capture a wide range of spectral bands, useful for agriculture and forestry.

Purpose: Earth observation for weather forecasting, climate monitoring, and atmospheric and sea surface temperatures. Key Features: Polar orbit, carries advanced imaging and sounding sensors, predecessor to the NOAA-20 satellite.

Purpose: Provide real-time weather data to assist weather forecasting and severe storm tracking. Key Features: Geostationary orbit over Western Hemisphere, advanced imaging capabilities, lightning mapping sensor.

Purpose: To observe the formation of stars and galaxies, planet atmospheres, and other cosmic phenomena. Key Features: Large segmented mirror (6.5 meters across), observes in infrared, planned successor to the Hubble Space Telescope.

Purpose: Serves as a habitable artificial satellite and research laboratory. Key Features: Modular structure, international collaboration, continuously inhabited since November 2000.

Purpose: European global navigation satellite system (GNSS) providing accurate positioning service. Key Features: Alternative to the U.S. GPS system, civilian-controlled navigation, high-precision satellite clocks.

Purpose: High capacity communication services including high-speed internet for North America. Key Features: Geostationary orbit, Ka-band broadband satellite, large coverage area.

Purpose: To improve weather predictions through advanced data collection on atmospheric conditions. Key Features: Polar orbiting, carries five key environmental instruments, successor to the Suomi NPP satellite.

Purpose: To observe X-rays from high-energy regions of the universe. Key Features: High-resolution mirror, can detect X-ray sources billions of light-years away, named after Nobel laureate Subrahmanyan Chandrasekhar.

Purpose: Earth observation to monitor the impact of human activity on climate and the environment. Key Features: First satellite of NASA's Earth Observing System, carries five scientific instruments, monitors Earth's oceans, land, and atmosphere.

Purpose: Provide global positioning system services for military and civilian use. Key Features: Part of the GPS Block IIF satellites, atomic clocks for precise timekeeping, advanced anti-jamming capabilities.

Purpose: To capture high-resolution images and spectra of distant astronomical objects. Key Features: Large mirror (2.4 meters in diameter), orbits outside Earth's atmosphere for clear views, services multiple times for upgrades and repairs.

Purpose: Part of China's space station program for scientific experiments and human spaceflight. Key Features: Two-module space lab, served as crewed spacecraft test bed, deorbited in 2018.

Purpose: To monitor sea level and provide ocean and weather data. Key Features: Dual-satellite mission, advanced radar altimeters, measures sea-level variation to high accuracy.