1. Solar System

2. The sun The sun’s mass is 99.8% of all the mass in the solar system.
The sun is a ball of glowing gas that is about ¾ hydrogen and ¼ helium.

5. The Sun
Although the Sun looks very large in our sky, it is an average size star.
There are many stars larger than the Sun, but the Sun looks much bigger because it is so much closer to Earth.
The Sun is at the center of our solar system and is the only star in our solar system.

6. How big is the Earth?

11. INNER PLANETS Small Rocky Surface Called “Terrestrial” Planets Solid
No rings
Short Revolution

12. OUTER PLANETS No solid surfaces Called “Gas Giants”
Might have partly solid core
Have lots of moons and satellites
Long revolution
Have rings