Solar Maximum Mission

(SMM) A NASA solar observatory that was launched into a 574-km, 96-minute Earth orbit in Feb. 1980 to study flares and other phenomena on the Sun during the then current maximum of solar activity. Instruments included gamma-ray, ultraviolet, and X-ray spectrometers, a coronagraph, and a radiometer. The SMM was the first multimission modular spacecraft. Later in 1980 a blown fuze and other control problems left it unable to point correctly. In Apr. 1984 Solar Max was maneuvered into the bay of a space shuttle, repaired, and successfully relaunched, and operated effectively until it reentered the Earth's atmosphere and burned up in Dec. 1989.

单词	solar maximum mission
释义	Solar Maximum Mission Solar Maximum Mission (SMM) A NASA solar observatory that was launched into a 574-km, 96-minute Earth orbit in Feb. 1980 to study flares and other phenomena on the Sun during the then current maximum of solar activity. Instruments included gamma-ray, ultraviolet, and X-ray spectrometers, a coronagraph, and a radiometer. The SMM was the first multimission modular spacecraft. Later in 1980 a blown fuze and other control problems left it unable to point correctly. In Apr. 1984 Solar Max was maneuvered into the bay of a space shuttle, repaired, and successfully relaunched, and operated effectively until it reentered the Earth's atmosphere and burned up in Dec. 1989. AcronymsSeeSMM
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