Question

which force keeps the planets from floating off into space?
earths gravity
the suns gravity
the moons gravity
milky ways gravity

Explanation:

Planets in our solar system orbit the Sun. The Sun's mass is extremely large, and according to Newton's law of universal gravitation, it exerts a gravitational force on the planets. This gravitational force provides the centripetal force required for the planets to follow their orbital paths around the Sun instead of floating off into space. Earth's gravity mainly affects objects on Earth or in Earth's vicinity (like the Moon). The Moon's gravity is much weaker and has a significant effect mainly on Earth (e.g., tides). The Milky Way's gravity is a much larger - scale force that affects the motion of the solar system within the galaxy, but it is the Sun's gravity that directly keeps the planets in their solar - system orbits.

Answer:

the Sun's gravity