Editing Solar System (section)

=== Inner solar system ===
[[File:Terrestrial planet size comparisons.jpg|thumb|The inner planets. From left to right: [[Mercury (planet)|Mercury]], [[Venus]], [[Earth]], and [[Mars]]]]

The first four planets closest to the Sun are called the inner planets. They are small and dense terrestrial planets, with solid surfaces. They are made up of mostly rock and metal with a distinct internal structure and a similar size. Three also have an [[atmosphere]]. The study of the four planets gives information about [[geology]] outside the Earth. 

* [[Terrestrial planet|Terrestrial planets]] region contains the four planets closest to the sun, all are rocky planets
** '''(1)''' [[Mercury (planet)|Mercury]]
** '''(2)''' [[Venus]]
** '''(3)''' [[Earth]]
** '''(4)''' [[Mars]]
* [[Asteroid belt]] region contains;
** ''(a)'' [[Ceres (dwarf planet)|Ceres]] (the only '''[[dwarf planet]]''' in this region)
** [[Asteroid]]s