1. THE UNIVERSETHE UNIVERSE

2. 2 THEORIES2 THEORIES

3. 1- GEOCENTRIC THEORY1- GEOCENTRIC THEORY::
• Who proposed it?:Who proposed it?:
 PtolomyPtolomy
When?When?
In the 2nd century BCIn the 2nd century BC
2- HELIOCENTRIC THEORY2- HELIOCENTRIC THEORY
Who proposed it?Who proposed it?
Nicolas CopernicusNicolas Copernicus
When?When?
In 1542 (16th century)In 1542 (16th century)

4. What makes up theWhat makes up the
Universe?Universe?
►It is all theIt is all the ::
 MatterMatter
 EnergyEnergy
 SpaceSpace
►The Universe is made up ofThe Universe is made up of ::
 GALAXIES.GALAXIES.
 Galaxies contain STARSGalaxies contain STARS

6. OUR GALAXY: The MilkyOUR GALAXY: The Milky
WayWay

7. PLANETSPLANETS STARSSTARS
Bodies which orbitBodies which orbit
some starssome stars
Clouds of gasesClouds of gases
pulled together bypulled together by
gravitational forcesgravitational forces
They don´t emitThey don´t emit
lightlight
They emit heat andThey emit heat and
lightlight

8. OUR SOLAR SYSTEM IS MADEOUR SOLAR SYSTEM IS MADE
UP OFUP OF
►ONE STAR: The SunONE STAR: The Sun
►8 PLANETS with their Satellites8 PLANETS with their Satellites
►Dwarf planets: Pluto, Ceres, ErisDwarf planets: Pluto, Ceres, Eris
►Small Solar System bodies:Small Solar System bodies:
 AsteroidsAsteroids
 CometsComets
 SatellitesSatellites

9. INNER PLANETSINNER PLANETS OUTER PLANETSOUTER PLANETS
Closest to the SunClosest to the Sun Not so close to theNot so close to the
Sun (far)Sun (far)
Rocky planets, madeRocky planets, made
of rockof rock
Made of gases (GasMade of gases (Gas
giants)giants)
MercuryMercury
VenusVenus
EarthEarth
MarsMars
JupiterJupiter
SaturnSaturn
UranusUranus
NeptuneNeptune

11. ASTEROID BELTASTEROID BELT

13. Units of measurementUnits of measurement
►Astronomical unitsAstronomical units
 The distance fromThe distance from
the Earth to the Sun.the Earth to the Sun.
Light-yearLight-year
The distance light travels in one yearThe distance light travels in one year..

14. ►VideoVideo