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Gravitational fields (and force!) obey the principle of superposition. You can show that the field follows a spherical symmetry near the planets but the influence of the Earth extends farther because of its superior mass (80 times Moon's mass).

Notice the existence of a single point where the g field is equal to zero.

Click on the screen to show or erase the field lines.

This animation is not to scale.

- To apply the superposition principle to determine the gravitational field at any point between the Earth and the Moon.
- To show how much stronger the earth's field is compared to that of the Moon.