Lesson 4 is about the mirco planets, comets, and asteroids in our solar system.
Solid Rock
Ice and Dust
Gas
Magic
Neptune and Pluto
Earth And Mars
Mars and Jupiter
Saturn and Jupiter
Uranus and Neptune
Beyond Neptune
Next to Earth
Between Mars and Jupiter
Between the Sun and Mercury
Between Earth and Mars
Makemake
Sedna
Eris
Pluto
Ceres
Chicago, IL, USA
Tunguska, Russia
London, UK
Paris, France
Santiago, Chile