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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
