* Gas Giants: All four are classified as gas giants, meaning they are primarily composed of hydrogen and helium with a small rocky core.
* No Solid Surface: They don't have a solid surface like Earth or Mars. Instead, their atmospheres gradually become denser and denser until they transition into a liquid state.
* Large Size and Mass: These planets are significantly larger and more massive than the inner planets.
* Multiple Moons: They all possess numerous moons, some with unique characteristics and potential for harboring life.
* Ring Systems: While Saturn is famous for its prominent rings, all four gas giants have ring systems composed of dust and ice particles.
* Strong Magnetic Fields: They have powerful magnetic fields, much stronger than Earth's, which are generated by their rapid rotation and internal processes.
* Cold Temperatures: They are extremely cold due to their great distances from the sun.
These shared features distinguish the outer planets from the inner planets (Mercury, Venus, Earth, and Mars) and make them fascinating subjects of scientific exploration.
