One of five specific points in space where the gravitational forces of two large bodies (like the Sun and Earth) balance with the centrifugal force of a smaller object, allowing it to maintain a stable position relative to the two larger bodies.
Named after Italian-French mathematician Joseph-Louis Lagrange, who discovered these equilibrium points in 1772 while studying the three-body problem in celestial mechanics. The concept became practically important with the space age for positioning satellites and space telescopes.
Lagrange points are like cosmic parking spots where spacecraft can 'hover' with minimal fuel use - the James Webb Space Telescope sits at the L2 point, 1.5 million kilometers from Earth, where it can observe deep space while staying in Earth's shadow! These points also collect space dust and asteroids, forming the Trojan asteroids that share Jupiter's orbit.
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