1_THE UNIVERSE

1_THE UNIVERSE

1. THE EARTH

   • 4.600 million years
   • SIZE AND SHAPE
     • Small
     • Geoid, wider at the equator
   • ROTATION
     • Continually moving
     • Spins on an imaginary axis from th N to the S: 24h
   • CONSEQUENCES
     • Change from DAY to NIGHT
       • Solar light illuminates and heats a half (day). Other half: dark + cold (night)
     • MOVEMENT of the sun in the HORIZON
       • From WEST to EAST
     • HOURS a day
       • Divide the day into 24 equal parts
   • LIFE exists
     • 2000 million years: Bacteria and Algae
     • TEMPERATURE: moderated, right distance.
     • ATMOSPHERE: protects from dangerous solar radiation
     • WATER: THE OLY PLANET
   • REVOLUTION
     • The Earth turns around the Sun
       • From WEST to EAST
     • 365 days + 6h

2. DESCRIPTION

   • 13.700 million years
     • Big Bang
       • Formed of:
         • Stars
           • Celestial bodies
             • Interstellar matter: dust and gas
               • Space
           • Grouped: GALAXIES
             • Milky Way
               • Earth
                 • Thousands of millions of stars
                   • Planetary System
                     • Celestial bodies: Planets, satellites, asteroids and comets
                     • SOLAR System
                       • 5000 million years
                         • Star: Sun
                           • Planets: 8
                             • Asteroids and comets
                               • Satellite: the Moon