If there were no gravity planets would collide with one another. Thus, this statement is true.
Every planet is at a different distance from the Sun and every planet has a fixed orbit in which it moves around the Sun. The Sun gravitational force holds the planets in this place and they do not strike with each other as their orbits are non intersecting.
Instead, planet would fly off in what ever the direction gravity was keeping them from going.
For more information regarding planets, visit:
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