Earth's gravitational force technically never becomes *zero*. It follows the inverse square law, meaning it weakens with distance but never completely disappears.

However, there are a few ways to interpret your question:

1. Practically zero:

* At a very large distance from Earth: The further you go from Earth, the weaker the gravitational force becomes. At a distance far enough, the gravitational pull from other celestial bodies (like the Sun or other planets) might be stronger than Earth's. However, this is a relative concept, not a point where the force is absolutely zero.

* At the Lagrange points: These are specific points in space where the gravitational forces of two celestial bodies balance out. For instance, the Earth-Sun Lagrange points L1, L2, and L3 are locations where the gravitational forces of the Earth and Sun cancel each other out. However, the Earth's gravitational force is still present, just balanced out by the Sun's.

2. Zero within Earth's system:

* At the Earth's center: If you were to magically teleport to the Earth's center, the gravitational pull would be zero. This is because the mass of the Earth is distributed equally around you. However, this is a theoretical scenario and impossible to achieve in reality.

In conclusion, there's no single point where Earth's gravitational force becomes absolutely zero. However, it can be practically negligible at extremely large distances or balanced out at specific locations like Lagrange points.