The Universe

The Big Bang theory

The theory of inflation

The position of the Earth in the Universe

Distances in the universe
Light year

Parsec

Astronomical unit

Galaxies

Nebulae

The Milky Way

Constellations

Stars

The Solar System

The Sun

The structure of the Solar System

The movements of the planets

Planets in the Solar System

Inner planets

Outer planets

The Earth movements
The Earth's revolution

The Earth's seasons

The Earth's rotation

Time zones

The importance of the Earth's movements for the living things

The Sun, Earth and Moon

The phases of the Moon

Eclipses

Tides