General Features:

* Orbit the Sun: All four planets are part of our solar system and orbit the Sun.

* Made of gas and/or rock: While the composition differs drastically, they are all made of either gas or rock (or both in the case of gas giants).

* Have a gravitational pull: All planets exert a gravitational pull, influencing their moons and other celestial bodies in their vicinity.

* Experiences seasons: Though the duration and severity of seasons differ drastically due to axial tilt and orbital paths, all planets experience variations in sunlight and temperature throughout the year.

* Influenced by the Sun: All planets are significantly affected by the Sun's gravity, heat, and radiation.

Specific Similarities:

* Magnetic field: Earth, Jupiter, and Saturn all have significant magnetic fields, generated by their internal motion. Mars has a weak magnetic field, but evidence suggests it had a stronger one in the past.

* Moons: All four planets have natural satellites, or moons. Earth has one, Mars has two, Jupiter has 79, and Saturn has 82.

It's important to note that while these planets share some features, their differences are much more pronounced. They vary greatly in size, mass, composition, atmosphere, and overall environment.