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unstable Lagrangian point comparison table
Subject has location has definition has synonym
inner Lagrangian pointbetween the two bodies on the line passing through the centers of mass of the two bodiesAn unstable Lagrangian point between the two bodies on the line passing through the centers of mass of the two bodies. Mass transfer occurs through this point in a close binary star system.L1
L2beyond the most massive body on the line passing through the centers of mass of the two bodiesAn unstable Lagrangian point beyond the most massive body on the line passing through the centers of mass of the two bodies. 
L3beyond the less massive body on the line passing through the centers of mass of the two bodiesAn unstable Lagrangian point beyond the less massive body on the line passing through the centers of mass of the two bodies. 

Next Lagrangian pointstable Lagrangian point    UpLagrangian point