Advanced Composition Explorer
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The Advanced Composition Explorer (ACE), also known as Explorer 71, is a NASA mission to study matter comprising energetic particles from the solar wind, the interplanetary medium, and other sources. It was launched in August 1997 and reached the Sun-Earth Lagrange-1 point just four months later, where it remains in active operation to this day. It is expected to continue its mission until its propellant is completely exhausted by 2029
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