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An area of space where the gravity between two bodies is balanced. There are 5 Lagrangian points and of particular interest are the Earth-Sun L1 and L2 points, which are positioned 1.5 million kilometres from Earth. A satellite positioned at one of these points would be locked in its orbit around the Sun.

Currently the WIND, Solar and Heliospheric Observatory (SOHO), Advanced Composition Explorer (ACE), Deep Space Climate Observatory (DSCOVR) and LISA Pathfinder satellites are located at the L1 point with the Gaia probe at the L2 point.

The 5 Earth Sun Lagrangian points

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