1. The Solar System

2. Sun accounts for 99.85% of the mass of our solar system

3. Everything Else accounts for only 0.15% of the mass of our solar system

4. The 4 inner planets – terrestrial – are small and rocky They include Mercury, Venus, Earth, and Mars

5. The outer planets – jovian – are huge gas giants They include Jupiter, Saturn, Uranus, and Neptune

6. Terrestrial vs. Jovian Smaller Higher Density Slower Rotation Larger Lower Density Faster Rotation

7. Terrestrial vs. Jovian Consist mostly of rocks and metallic substances Thin atmospheres No/few moons Consist mostly of gases and ices Thick atmospheres Many Moons

8. Pluto doesn’t fit neatly into either category

9. Formation of the Solar System Nebular theory – The sun and planets formed from a rotating disk of dust and gassesNebular theory Brainpop

10. Planetesimals The small, irregular shaped body formed by colliding matter They continue to grow until they have enough mass to exert a gravitational pull on other objects