Which force keeps the planets from floating off into space? earth’s gravity the sun’s gravity the moon’s gravity milky way’s gravity

it's the Suns gravity...

The sun’s gravity keeps the planets from floating off into the space.

Option B

Explanation:

Gravitational force is an attractive force. It keeps two or more objects attracted to each other such that they will stay in the same plane but separated by a distance. So the gravity depends on the mass of the objects and distance of separation.

We are able to walk stable on the Earth due to Earth’s gravitational force. Each planet has its own gravitational force and their moons revolve around their corresponding planets due to the gravitational force of the planets on their moon.

Even artificial satellites follow the same procedure of revolving the planet. So all the planets in the universe are revolving around Sun due to the gravitational force of Sun acting on each of them otherwise they would have floated off into space.