The Earth in the Universe Geology

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1 The Earth in the Univers e The Earth in the Universe Geology

2 The origin of the Universe The position of the Earth in the Universe Distances in the Universe Galaxies The Milky Way Stars: The Sun The Solar System The movements of the planets Planets in the Solar System The Earth s revolution The Earth s rotation The importance of the Earth s movements for living things The Sun, Earth and Moon Oxford University Press España, S. A. Geology 2

3 The origin of the Universe Oxford University Press España, S. A. Geology 3

4 The Universe or Cosmos is defined as everything that exists. Oxford University Press España, S. A. Geology 4

5 The position of the Earth in the Universe Oxford University Press España, S. A. Geology 5

6 Geocentric model Heliocentric model Saturn Saturn Jupiter Jupiter Moon Mars Sun Venus Mercury Moon Mars Earth Venus Mercury Earth Sun The Earth is spherical and is the centre of the Universe. The Sun, the Moon and the planets revolve in concentric circles around the Earth. The stars are fixed on a dome that also revolves around the Earth The Sun does not move and is in the centre of the Universe. All the planets revolve around the Sun in concentric circles. The Earth rotates on its axis and the Moon revolves around the Earth. The stars are fixed on a dome that does not move. Oxford University Press España, S. A. Geology 6

7 Distances in the Universe Oxford University Press España, S. A. Geology 7

8 Light year A light year is equivalent to the distance travelled by light in one year. Light travels at a speed of km per second. 1 year x 365 days x 24 hours x segundos x km/s = 9.5 billion km Parsec A parsec (pc) is equivalent to 3.26 light years. La unidad astronómica An astronomical unit (AU) is the distance between the Earth and the Sun. 1 UA = 150 million km Oxford University Press España, S. A. Geology 8

9 Galaxies Oxford University Press España, S. A. Geology 9

10 Galaxies are huge group of stars, nebulae and interstellar dust and gas held together by the force of gravity. eliptical spiral barred spiral irregular Nebulae are huge clouds of gas. They are formed by concentrations of hydrogen and helium as well as interstellar dust. Oxford University Press España, S. A. Geology 10

11 The Milky Way Oxford University Press España, S. A. Geology 11

12 The Milky Way is a spiral galaxy, located in a galaxy cluster called the Local Group. disk nucleus halo Oxford University Press España, S. A. Geology 12

13 Stars: The Sun Oxford University Press España, S. A. Geology 13

14 Stars are large spheres of gas spheres made mostly of hydrogen and helium. Stars release energy in the form of light and heat. Type Temperature (ºC) Colour Example O >30000 Violet-blue Naos B Blue Rigel A White Vega F White-yellow Protion G Yellow Sun K Orange Arcturus M Red Betelgeuse photosphere core The Sun is a medium-sized yellow star with a surface temperature of 5500 ºC. Oxford University Press España, S. A. Geology 14

15 The Solar System Oxford University Press España, S. A. Geology 15

16 The Solar System consists of the Sun and the celestial bodies that orbit it. Pluto (dwarf planet) path of Halley s comet Composition: Planets Venus Earth Sun Mercury Mars Dwarf planets Satellites Saturn asteroid belt Jupiter Asteroid belt Uranus Neptune Comets Oxford University Press España, S. A. Geology 16

17 The movements of the planets Oxford University Press España, S. A. Geology 17

18 Revolution (year) Neptune Mercury Sun Pluto (dwarf planet) Venus Earth Venus 177⁰ Mercury 0.1⁰ Mars 25⁰ Earth 23.5⁰ Jupiter 3⁰ Rotation (day) Saturn 27⁰ Uranus 98⁰ Pluto (dwarf planet) 120⁰ Neptune 30⁰ Oxford University Press España, S. A. Geology 18

19 Planets in the Solar System Oxford University Press España, S. A. Geology 19

20 Inner planets The inner planets are small, have very little or no atmosphere and have a rocky surface. Outer planets The outer planets are very large and have a gaseous atmosphere. They are surrounded by rings and their surface is in a gaseous or liquid state. Oxford University Press España, S. A. Geology 20

21 The Earth s revolution Oxford University Press España, S. A. Geology 21

22 The Earth moves around the sun in an elliptical orbit. It takes the Earth 365 days, 5 hours and 49 minutes to complete one revolution. perpendicular to the ecliptic plane 23.5⁰ rotation axis revolution winter summer Sun summer winter smaller angle = bigger area bigger angle = smaller area ecliptic plane Oxford University Press España, S. A. Geology 22

23 The Earth s rotation Oxford University Press España, S. A. Geology 23

24 The Earth takes 23 hours and 56 minutes to complete one rotation on its axis. Rotation causes day and night. Oxford University Press España, S. A. Geology 24

25 The importance of the Earth s movements for living things Oxford University Press España, S. A. Geology 25

26 Many trees lose their leaves in autumn, when they detect a decrease in the hours of daylight. Trees then sprout new leaves in spring, with the increase in the hours of daylight. Flowering and forming of fruits also depend on temperatures and hours of daylight and darkness. Not all plants flower and form fruit in the same season. The mating and breeding seasons of many animals start when the days get shorter and temperatures lower. Some birds migrate at certain times of the year Oxford University Press España, S. A. Geology 26

27 The Sun, Earth and Moon Oxford University Press España, S. A. Geology 27

28 Moon Earth 5.15⁰ ecliptic plane Phases of the Moon first quarter solar eclipse Eclipses lunar eclipse Tides spring tides full moon new moon last quarter neap tides Oxford University Press España, S. A. Geology 28

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