If there had never been gravitational pull then none of the would have formed. If the gravitational pull was suddenly switched off then each body would continue to move in a straight line at a constant speed.
Planets orbit around the Sun because of the Sun's gravitational force, it makes the planets move by its gravitational force.
They move because of the gravitational pull of the sun.
The gravitational pull of the Sun.
Since the Sun has the most mass of all the objects in the solar system, it has the strongest gravitational pull. If there were another object in the solar system with more mass than the Sun, the planets (and the Sun itself) would orbit it. If there were no Sun's gravity (or other gravitational forces) the planets would travel in straight lines instead of orbits.
The gravitational pull
The reason for the slower movement of outer planets answers to the simple nature of the gravitational force, which varies with the inverse square of distance. For example, an object twice as distant would feel one quarter the gravitational pull. For a stable orbit, this would mean an outer planet would have to move more slowly. Meanwhile, the inner planets move more quickly, and Mercury, with an orbit closest to the sun, zips around it in only 88 days, compared to Naptune's 165 years.
When the pull is stronger, they move quicker.
When the pull is stronger, they move quicker.
The suns gravitational pull forces them to move in one direction
Each planet would move away from its orbital path in a direction tangential to the orbit. That means roughly "sideways" from a line between the Sun and the planet.
Each planet would move away from its orbital path in a direction tangential to the orbit. That means roughly "sideways" from a line between the Sun and the planet.
The gravitational pull of other objects in space affect all