The planets in our solar system are traditionally divided into two groups: the inner planets and the outer planets. The inner planets are Mercury, Venus, Earth, and Mars, while the outer planets are Jupiter, Saturn, Uranus, and Neptune.

The main difference between the inner and outer planets is their composition and formation. The inner planets are made mostly of rock and metal, while the outer planets are made mostly of gas and ice. The inner planets also formed closer to the Sun than the outer planets.

Here are some additional details about the inner and outer planets:

Inner Planets

* Composed mostly of rock and metal

* Formed closer to the Sun

* Smaller in size

* Have solid surfaces

* Have relatively thin atmospheres

* Have few or no moons

Outer Planets

* Composed mostly of gas and ice

* Formed farther from the Sun

* Larger in size

* Have gaseous surfaces

* Have thick atmospheres

* Have many moons