1. The Universe HOME CONTENTS RESOURCES ACTIVITY LINKS CONTENTS RESOURCES ACTIVITY LINKS CLOSE BACK

2. Contents The Universe Theories Components Units of measurement Timeline The Solar System Components Movement of planets Outer planets Components Inner planets Components Dwarf planets and small solar system bodies Components HOME HOME RESOURCES CONTENTS CLOSE BACK ACTIVITY LINKS

3. Resources HOME HOME What are the different theories about the Universe? What makes up the Universe? What units of measurement do astronomers use? Timeline What makes up the Solar System? How do the planets move? Which are the inner planets? Which are the outer planets? What are dwarf planets and small solar system bodies? Interactive activity: Solar system bodies RESOURCES CONTENTS CLOSE BACK ACTIVITY LINKS Links Animation: The Solar System

4. What are the different theories about the Universe? HOME 4,000 YEARS AGO 3,000 YEARS AGO ANCIENT GREECE 500 YEARS AGO RESOURCES CONTENTS CLOSE BACK ACTIVITY LINKS

5. What are the different theories about the Universe? 4,000 years ago Origin of Astrology HOME GO BACK RESOURCES CONTENTS CLOSE BACK ACTIVITY LINKS

6. What are the different theories about the Universe? Orion Scorpio 3,000 years ago Mythology HOME GO BACK RESOURCES CONTENTS CLOSE BACK ACTIVITY LINKS

7. What are the different theories about the Universe? Ancient Greece Geocentric theory The Earth was the centre of the Universe. HOME GO BACK RESOURCES CONTENTS CLOSE BACK ACTIVITY LINKS

8. What are the different theories about the Universe? 500 years ago Heliocentric theory The Sun was the centre of the Universe. HOME GO BACK RESOURCES CONTENTS CLOSE BACK ACTIVITY LINKS

9. What makes up the Universe? Galaxy cluster Milky Way Solar System HOME RESOURCES CONTENTS CLOSE BACK ACTIVITY LINKS

10. Animation: The Solar System HOME RESOURCES CONTENTS CLOSE BACK ACTIVITY LINKS

11. What units of measurements do astronomers use? SUN EARTH Astronomical unit (AU) The distance between the Earth and the Sun: about 150 million kilometres Seconds 0 Light-year The distance light travels in one year: about 9.5 trillion km Kilometres 0 1 300,000 UNITS OF MEASUREMENT HOME RESOURCES CONTENTS CLOSE BACK ACTIVITY LINKS

12. 16th 17th 18th 19th 20th CENTURY Nicolas Copernicus Heliocentric theory Tycho Brahe Planet movement Johannes Kepler Calculates planetary orbits Galileo Galilei Invented the telescope to study space Discovery of Uranus Johann Galle Discovery of Neptune Radio telescopes First person walks on Moon Space telescopes Timeline HOME RESOURCES CONTENTS CLOSE BACK ACTIVITY LINKS

13. What makes up the Solar System? outer planets Sun inner planets asteroid belt dwarf planet Kuiper belt Oort cloud HOME RESOURCES CONTENTS CLOSE BACK ACTIVITY LINKS

14. How do the planets move? revolution ecliptic plane rotation orbit HOME ENLARGE IMAGE RESOURCES CONTENTS CLOSE BACK ACTIVITY LINKS

15. How do the planets move? ecliptic plane orbit rotational axis ROTATION REVOLUTION HOME GO BACK RESOURCES C CONTENTS CLOSE BACK ACTIVITY LINKS

16. Which are the inner planets? HOME Mercury Earth Venus Mars RESOURCES CONTENTS CLOSE BACK ACTIVITY LINKS

17. Mercury Characteristics Which are the inner planets? Satellites : none Atmosphere : none Temperature : -180 to 430 ºC Diameter : 4,880 km Size : the smallest planet Distance : the closest to the Sun Earth Mars Venus HOME RESOURCES CONTENTS CLOSE BACK ACTIVITY LINKS

18. Venus Which are the inner planets? Characteristics Satellites : none Atmosphere : CO 2 Temperature : 465 ºC Diameter : 12,104 km Mercury Earth HOME RESOURCES Mars CONTENTS CLOSE BACK ACTIVITY LINKS

19. Characteristics Which are the inner planets? Satellites : 1 Atmosphere : N 2 +O 2 Diameter : 12,740 km Fact : the only planet with life Earth Mercury HOME RESOURCES Mars Venus CONTENTS CLOSE BACK ACTIVITY LINKS

20. Characteristics Which are the inner planets? Satellites : 2 (Deimos and Phobos) Atmosphere : CO 2 Temperature : - 50 ºC Diameter : 6,794 km Mars Mercury Earth HOME RESOURCES Venus CONTENTS CLOSE BACK ACTIVITY LINKS

21. Which are the outer planets? HOME RESOURCES Jupiter Saturn Uranus Neptune CONTENTS CLOSE BACK ACTIVITY LINKS

22. Characteristics Jupiter Which are the outer planets? Satellites : 63 Largest moons : Io, Callisto, Europa and Ganymede Diameter : 142,984 km Size : the largest planet HOME RESOURCES Uranus Neptune Saturn CONTENTS CLOSE BACK ACTIVITY LINKS

23. Characteristics Which are the outer planets? Satellites : 59 Largest moon : Titan Diameter : 120,536 km Size : the second largest Fact : a system of rings Saturn Jupiter HOME RESOURCES Uranus Neptune CONTENTS CLOSE BACK ACTIVITY LINKS

24. Characteristics Satellites : 27 Diameter : 51,118 km Axis : almost horizontal Fact : a system of rings Uranus Which are the outer planets? Jupiter Saturn Neptune HOME RESOURCES CONTENTS CLOSE BACK ACTIVITY LINKS

25. Characteristics Neptune Which are the outer planets? Satellites : 13 Diameter : 49,528 km Size : smaller than Uranus Distance : the most distant from the Sun Jupiter Saturn Uranus HOME RESOURCES CONTENTS CLOSE BACK ACTIVITY LINKS

30. Interactive activity: Solar System bodies HOME HOME RESOURCES CONTENTS CLOSE BACK ACTIVITY LINKS

31. Links HOME HOME RESOURCES CONTENTS CLOSE BACK ACTIVITY LINKS GO TO WEBSITE The Solar System The Universe GO TO WEBSITE