In a far-off galaxy, an astronomer observes a moon orbiting a planet. The moon stays in orbit because of the planet’s gravity.Which scenario would increase the gravity of the planet?

A planet’s gravitational pull depends on its mass and the distance to the moon. Increasing the planet’s inertia means increasing its mass, which makes its gravity stronger. Changing the moon’s distance changes the gravitational force between them, but it does not increase the planet’s gravity itself; increasing the moon’s inertia changes the moon’s mass.

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