= Sphere of influence (astrodynamics)
{wiki=Sphere_of_influence_(astrodynamics)}
In astrodynamics, the "sphere of influence" (SOI) refers to the region around a celestial body within which that body exerts a dominant gravitational influence on an object, such as a spacecraft, compared to the influence of other gravitational bodies. The concept is crucial for trajectory planning and navigation in space, as it helps determine when to consider the gravitational effects of a particular body.
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