1. Planets of the Solar System
Review of Chapter 27
Planets of the Solar System

2. The Solar system Was formed from a solar nebula.
The solar system was modeled by Copernicus who said that the solar system is heliocentric.
Two other scientists that were interested in astronomy, named Ptolemy and Aristotle said the solar system is geocentric

3. What is heliocentric?
A sun-centered model of the solar system. The planets revolve around the sun in the same direction but at different speeds and distances from the sun.
What is geocentric? A model of the solar system where the sun, stars and planets revolve around Earth.

4. The solar system Includes planets which orbit the sun in ellipses.
The planets were formed from protoplanets
The inner planets are also called terrestrial planets.
Inner planets such as the Earth all formed the layers of: mantle, core and crust through the process of differentiation.

5. The planets such as The outer planets are gas giants.
Outer planets include Pluto as a 3rd category even though scientists do not really know what category to place Pluto in.
The gas giants are Jupiter, Saturn, Uranus and Neptune.