NASA's ACE satellite still monitoring solar wind 29 years after launch
NASA launched the Advanced Composition Explorer on August 25, 1997, to study energetic particles and the solar wind from the L1 Lagrange point. The spacecraft provides continuous space weather data, helping forecast geomagnetic storms that can affect satellites and power grids. After nearly three decades, ACE remains one of NASA's oldest operational sun-monitoring missions.
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Original headline: “On this day in space! Aug. 25, 1997: NASA launches Advanced Composition Explorer to track solar wind and so much more.” Browse more stories.