When the mass of an object is doubled, the strength of its gravitational pull also doubles.

Here's why:

* Newton's Law of Universal Gravitation: This law states that the force of gravity between two objects is directly proportional to the product of their masses. This means if you increase one mass, the force of gravity increases proportionally.

* Formula: The formula for gravitational force is F = G * (m1 * m2) / r², where:

* F = Force of gravity

* G = Gravitational constant

* m1 = Mass of object 1

* m2 = Mass of object 2

* r = Distance between the centers of the objects

Therefore, doubling the mass of one object (let's say m1) while keeping everything else constant will also double the gravitational force (F).