UARS Upper Atmosphere Research Satellite Type Orbiter Launch Sept. 12, 1991 Location Earth orbit Objective Study Earth's upper atmosphere Learn more about UARS UARS Stories Explore All UARS Stories Article1 Min ReadTOPEX/El Niño Watch – El Niño Moisture in the Atmosphere, January and February, 1998Article2 Min ReadTOPEX/El Niño Watch – El Niño Moisture in the Atmosphere, February 22, 1998 1 Min ReadMicrowave Limb Sounder/El Niño Watch – February thru December, 1997Article 2 Min ReadMicrowave Limb Sounder/El Niño Watch – December, 1997Article 2 Min ReadMicrowave Limb Sounder/El Niño Watch – Water Vapor Measurement, October, 1997Article Keep Exploring Discover More Topics From NASA James Webb Space Telescope Webb is the premier observatory of the next decade, serving thousands of astronomers worldwide. It studies every phase in the… Perseverance Rover This rover and its aerial sidekick were assigned to study the geology of Mars and seek signs of ancient microbial… Parker Solar Probe On a mission to “touch the Sun,” NASA's Parker Solar Probe became the first spacecraft to fly through the corona… Juno NASA’s Juno spacecraft entered orbit around Jupiter in 2016, the first explorer to peer below the planet's dense clouds to…