On Aug. 25, 1997, NASA launched the Advanced Composition Explorer, or ACE satellite to study energetic particles traveling through space.
It lifted off from Kennedy Space Center in Florida on a Delta II rocket and spent the next three and a half months making its way to its orbital post near the L1 Lagrangian point, a point of gravitational equilibrium between Earth and the sun.
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There, the spacecraft is monitoring the stream of accelerated particles coming from the sun known as the solar wind.
ACE provides 24/7 continuous coverage of the solar wind, which lets scientists know when to expect geomagnetic storms that can disrupt communication satellites and power grids on Earth.
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