* All planets orbit the Sun in the same direction. This is referred to as prograde motion and is a consequence of the initial conditions of the solar nebula from which the solar system formed.

* All planets orbit the Sun in roughly the same plane. This plane is called the ecliptic, and the vast majority of the solar system's mass lies within it.

* All planets follow elliptical orbits. While the orbits are close to circular, they are slightly elliptical, meaning the distance between a planet and the Sun varies slightly throughout its orbit.

* The orbital speed of a planet is influenced by its distance from the Sun. Planets closer to the Sun move faster than those farther away. This is due to Kepler's Laws of Planetary Motion.

Additional Similarities:

* Planets are constantly moving. They don't just orbit the Sun, but also rotate on their axes.

* Gravitational interactions. Planets exert gravitational forces on each other, leading to subtle perturbations in their orbits.

* All planets experience tidal forces. This is due to the gravitational pull of the Sun and other planets.

* All planets are influenced by the Sun's solar wind. This stream of charged particles can affect a planet's atmosphere and magnetic field.

It's important to note that these are generalizations. There are exceptions, such as Mercury's highly eccentric orbit. However, the overall similarities in the movement of planets reflect the common origin and forces that govern their behavior in the solar system.