Inner Planets (Terrestrial Planets)
* Composition: Primarily composed of rock and metal (iron, nickel, silicon, oxygen).
* Density: High density due to their rocky composition.
* Size: Smaller in size compared to outer planets.
* Atmosphere: Thin or nonexistent atmospheres, composed primarily of carbon dioxide, nitrogen, and oxygen.
* Moons: Few or no moons.
* Temperature: Higher surface temperatures due to their proximity to the Sun.
* Surface: Solid, rocky surfaces with craters, mountains, and volcanoes.
* Rotation: Relatively fast rotation periods.
* Examples: Mercury, Venus, Earth, Mars
Outer Planets (Gas Giants)
* Composition: Composed primarily of hydrogen and helium, with traces of heavier elements like methane, ammonia, and water.
* Density: Low density due to their gaseous composition.
* Size: Much larger than inner planets.
* Atmosphere: Thick, dense atmospheres with strong winds and storms.
* Moons: Numerous moons, some of which are larger than the inner planets.
* Temperature: Low surface temperatures due to their distance from the Sun.
* Surface: No solid surface, but have a central core composed of rock and metal.
* Rotation: Relatively slow rotation periods.
* Examples: Jupiter, Saturn, Uranus, Neptune
Key Differences:
* Composition: Inner planets are rocky, while outer planets are gaseous.
* Size: Outer planets are significantly larger than inner planets.
* Density: Inner planets are denser than outer planets.
* Atmosphere: Inner planets have thin or nonexistent atmospheres, while outer planets have thick, dense atmospheres.
* Temperature: Inner planets are hotter than outer planets.
These characteristics are a result of the different conditions in the early solar system where the planets formed. The inner planets formed closer to the Sun, where it was hotter and there was less material available. The outer planets formed farther away from the Sun, where it was colder and there was more material available.
