We first discovered the solar system, its planets and the objects of the solar system in the first 3 lessons. 

Lesson #1 - Solar System

Our solar system is composed of 8 planets that revolve around the Sun.

    - Mercury
    - Venus
    - Earth
    - Mars
    - Jupiter
    - Saturn
    - Uranus
    - Neptune

The planets turn on themselves (rotation) and around the Sun (Revolution). 

Lesson #2 - Planets

The first 4 planets have a soil. They are rocky planets (Mercury, Venus, Earth, Mars).

The next 4 planets have no soil; they are gaseous planets (Uranus and Neptune are even frozen).

Lesson #3 - Solar system objects

The sun is a star (ball of gas and fire).
Planets: ball-shaped stars (which do not produce light).
Satellites: stars that revolve around a planet. 
Asteroids: these are rocky stars.
Comets: These are balls of ice and dust. We see them shine when they approach the sun. 

In the next two lessons, we worked on the diameters of the planets and then on their distances from the Sun. We realized that the drawings / diagrams in the books were wrong. 

Lesson #4 - Diameter of the planets

We drew the planets of the solar system, the Sun and the Moon on the playground floor to realize the proportions of each. 

Lesson #5 - Distance of the planets

We went to the street to understand the distance of the planets from the Sun. The distances are so great that the 700 meters of street allowed us to put only the first 4 planets.