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Solar Maximum Mission
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== End of mission == SMM's orbit slowly decayed due to atmospheric drag taking it down into denser regions. The [[March 1989 geomagnetic storm]] was reported to have led to SMM dropping half a kilometre at the start of the storm and 5 kilometres over the whole period.{{r|Allen_1989}} The satellite eventually lost attitude control on November 17, 1989, and re-entry and burn-up occurred on December 2, 1989, over the Indian Ocean.{{r|hao-smm}}
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