Planets can't really get out of their orbits because of gravity; if gravity somehow stopped having an effect, the planets would continue in a straight inertial line with inertia from the point at which gravity stopped.
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If the planets did not move in their fixed orbits they may dash each other.
Then the laws of physics would be broken. An impossibility.
they wouldn't go around the sun and they wouldn't have lights at night.
The planets revolve in elliptical orbits. The inner planets have orbits 230 million km or less from the Sun. The outer planets have orbits 775 million km or greater.
The orbits of the planets would all be much larger if the sun had less gravity. They might even just fly off free.
Gravity from the Sun holds the planets in their orbits.
No, Venus and Earth have not swapped orbits. The orbits of planets are stable over long time scales due to the laws of gravity, and such an event is extremely unlikely to happen naturally.
If a planet doesn't follow its orbital path, then it may crash into other planets, moons and/or other object floating around in space.
All the planets have orbits so four cannot be picked out.
their orbits
The forces of gravity between two masses are the cause of all orbits.