Lagrangian point
Sign in to saveone of five positions in an orbital configuration of two large bodies where a small object can maintain a stable relative position
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A Lagrangian point is a location in space where a small object can stay in a fixed position relative to two larger orbiting bodies, like Earth and the Sun, without needing to use fuel to maintain its spot. These points matter because they're useful places to park spacecraft and telescopes, since the objects naturally stay put there due to the balance of gravitational forces.
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Lagrange points in the Sun–Earth system (not to scale). This view is from the north, such that Earth's orbit is counterclockwise. A contour plot of the effective potential due to gravity and the centrifugal pseudo-force of a two-body system in a rotating frame of reference. The arrows indicate the downhill gradients of the potential around the five Lagrange points, toward them (red) and away from them (blue). Counterintuitively, the L4 and L5 points are the high points of the potential. At the points themselves these forces are balanced. An example of a spacecraft at Sun–Earth L2, the Wilkinson Microwave Anisotropy Probe, or WMAP WMAP Earth
In celestial mechanics, the Lagrange points (/ləˈɡrɑːndʒ/), also called the Lagrangian points or libration points, are points of equilibrium for small-mass objects under the gravitational influence of two massive orbiting bodies. Mathematically, this involves the solution of the restricted three-body problem.