ACE:
The Advanced Composition Explorer (ACE) spacecraft was designed to study spaceborne energetic particles from the L1 Libration Point, about 1.4 million kilometers from Earth. Specifically, the spacecraft was launched to investigate the matter ejected from the Sun to establish the commonality and interaction among the Sun, Earth, and the Milky Way galaxy.

In addition, ACE also provides real-time space weather data and advanced warning of geomagnetic storms. ACE's nine instruments have a collecting power that is 10 to 10,000 times greater than anything previously flown.

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08.25.97:  Launch Status:  Orbiting L1 Point Show All Dates for ACE		Solar System Bodies: Our Solar System NASA Heliophysics Division NASA Science Mission Directorate: Helophysics
ACE orbits the Sun at the Lagrangian Point L1 between the Earth and the Sun. Lagrangian points are where the gravitational forces acting between two objects cancel each other out and can be used by spacecraft to hover. The gravitational points are named for Italian mathematician Joseph Louis Lagrange (above).