Each week, we talk about one of NASA's 18 missions studying the sun-Earth connection. http://1.usa.gov/S8PiqB pic.twitter.com/cAV7ruV14f
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@ISEE3Reboot Yes, you are! Should have said "18 missions currently in operational phase,” but it didn’t fit in tweet character count. :-)Thanks. Twitter will use this to make your timeline better. UndoUndo
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