For most interplanetary missions, Earth's gravitational pull on spacecraft can be modeled as a sphere of influence of about 1 million km. https://en.wikipedia.

For most interplanetary missions, Earth's gravitational pull on spacecraft can be modeled as a sphere of influence of about 1 million km. https://en.wikipedia.org/wiki/Sphere_of_influence_(astrodynamics) https://en.wikipedia.org/wiki/Sphere_of_influence_(astrodyna...