THE UNIVERSE AND THE EARTH
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1 ESO1 THE UNIVERSE AND THE EARTH
2 Unit 1 What is the Universe like? Universe theories Ideas about the Universe: Geocentric theory Aristotle (B.C) and Ptolomy (A.D) Heliocentric theory Copernicus in 1542 Galileo Galilei invented the telescope Johannes Keppler 1571verified this theory
3 Unit 1 The current concept of the universe Universe theories Current Ideas about the Universe: It is made up of matter and energy Galaxies (stars and nebulas) Stars and stellar wind Big Bang (expanding theory)
4 Unit 1 The expanding universe Universe theories
5 How big is the Universe? Universe units Astronomical unit (AU): this is equal to the distance between the Earth and the Sun. Distances between planets in our Solar System are expressed in astronomical units 1UA: 150 million kilometres Compare the distance of these planets from the Sun: Planet Distance from Sun (AU) Mercury 0.39 Venus 0.72 Earth 1.00 Mars 1.52 Jupiter 5.20 Saturn 9.54 Uranus Neptune 30.06
6 How big is the Universe? Universe units Astronomical unit (AU)
7 Unit 1 How big is the Universe? Universe units Light-year (ly): this is the distance that light travels in a year at its normal speed ( km per second). Galactic dimensions and the distances to other galaxies or to other objects in the universe that are far away are expressed in lightyear. One ly is equal to just under 10 trillion kilometers. Source of light The Sun Centauri, the nearest star Betelgeuse The Andromeda Galaxy Time to reach the earth 8 mins. 20 sec 4 light-years 500 light-years 2.3 million light-years away
8 Universe? Universe made up of Components of the Universe Galaxies are grouped together in galaxy clusters. Galaxies contain nebulae (clouds of dust) and star cluster (a lot of stars together) Stars are massive spherical bodies of gases. Some stars have planetary systems with planets, satellites, asteroids and comets (e.g the Sun)
9 Universe? Nebula Nebulae are very large clouds of dust and gases (hydrogen and helium) The Trifid Nebula
10 Universe? Nebula The Eagle Nebula The Rosette Nebula
11 Universe? Star cluster Star cluster are composed of lots of stars that are very close to each other Globular star cluster
12 Universe? Galaxies Our Galaxy: The Milky Way Globular star cluster The Milky Way is the galaxy that contains our Solar System Its name derived from its appearance ( a thick white band across the dark sky)
13 Universe? The Milky Way is a spiral galaxy Galaxies
14 Universe? Galaxies Our Galaxy: The Milky Way Globular star cluster Components: Nucleus (bulge) with old stars Disk (spiral arms) with the youngest stars, the Sun is in Orion Arm Halo with isolated stars
15 Universe? Stars Stars are large spheres of hydrogen and helium that release energy Nuclear fusion (hydrogen particles combine to form helium and release energy)
16 Universe? Stars Properties: Brightness depends on the distance between the star and us Colour depends on the surface temperature
17 Universe? Stars Class Temperature (ºK) Color Example O Blue Alnitak, Mintaka B Blue-White Rigel, Spica A White Vega, Sirius F White Procyon, Canopus G Yellow- White Capela, The Sun K Orange Epsilon, Eridanus M Red Barnard s Star, Glese
18 Universe? Stars The Sun a mediumsized G- type star 75% hydrogen, 25% helium, oxygen, carbon, Rotation is anticlockwise It takes between 25 (at equator) and 30 days (at poles) Tº 5778 K (5505 C) Diameter km
19 Universe? Stars Rotation of the Sun
20 Solar System? The Solar System Components of the Solar System The Sun a medium sized- G- type star The Planets (spherical bodies which orbit the Sun: inner planets: Mercury, Venus, Earth, Mars, outer or gas planets :Jupiter, Saturn, Uranus and Neptune) The Dwarf planets (small spherical bodies which orbit the Sun Pluto,Ceres, Eris The Satellites (natural objects that move around the planets), e.g the Moon The Comets (rocks, dust and ice), e.g Halley s Comet
21 Solar System? The Solar System Components of the Solar System
22 Solar System? The Solar System The asteroid belt is the region of the Solar System located between the orbits of Mars and Jupiter.
23 Solar System? The Solar System Asteroids are rocky objects which irregular shape Asteroids orbit the Sun, most of them are between Mars and Jupiter
24 Solar System? The Solar System The Kuiper belt is a region beyond Neptune that is full of comets (e.g Halley s comet), asteroids and other debris. It circles the solar system and has always been a little bit of a mystery as it is so far away and hard to explore
25 Solar System? The Solar System Comets: are small bodies that travel around the Sun in highly elliptical orbits. They are irregular in shape. The nucleus is made up of a mass of ice, dust and gas. When comets travel close to the Sun, some of the ice evaporates, creating the long, bright tails of the comets.
26 Solar System? The Solar System Oort Cloud is a spherical cloud of predominantly icy planetesimals that lie 50,000 ic AU that or may 1 lightyear from the lie roughly Sun.
27 Universe? Planets
28 Universe? Planets Unit 1
29 Solar System? Planets Unit 1
30 Solar System? Planets Unit 1
31 Solar System? Planets Unit 1
32 Solar System? Planets Unit 1
33 Solar System? Planets Unit 1
34 Solar System? Planets Unit 1
35 Solar System? Dwarf Planets Unit 1
36 Solar System? Dwarf Planets Ceres: It is a rock ice body 950 km (590 mi) in diameter and the smallest identified dwarf planet. Eris is may be larger than Pluto. Unit 1
37 Movements of the Earth Seasons Unit 1
38 Movements of the Earth Seasons Unit 1 The Earth has two movements: revolution and rotation Revolution (the earth orbits around the Sun), revolution causes the seasons, equinoxes and solstices Rotation (the earth spins around its own axis) The rotation of the Earth every 24 hours causes day and night The tilt of the axis determine the lenght of the day and night during the different seasons Rotation (North Pole) is anticlockwise (from west to east) so the Sun rises in the east
39 Movements of the Earth Seasons Unit 1 The axis of the Earth is an imaginary line on which the Earth rotates. It links up the two poles. Both, the axis and the Earth are titled at an angle of 23º5 during a revolution. When the Sun is directly overhead we call this the overhead Sun at this time the Earth surface and the midday sun forms a 90 degrees angle.
40 Movements of the Earth Spring equinox: on the 21 st or 22 nd mars the overhead sun is over the Equator. Seasons The Equator receives the largest amount of solar radiation. At this time the northern hemisphere is in the spring equinox while the southern hemisphere is in the autumn equinox. The angle of the Sun decreases towards the Poles. Unit 1 On this day the two hemispheres receives a similar amount of solar radiation and the length of days and nights is the same in all the places on the Earth. After this day it is spring in the northern hemisphere where the day is longer than the night.
41 Movements of the Earth Seasons Unit 1 Summer solstice 21 st or 22 nd the June the overhead Sun is over the Tropic Cancer. It receives the largest amount of solar radiation. At this time the northern hemisphere is in the summer solstice while the southern hemisphere is in the winter solstice. The angle of the Sun decreases towards the Poles. On this day the length of daytime of the northern hemisphere is the longest in the year while that of the southern hemisphere is the shortest in the year. Besides there are twenty four hours of daylight at the Artic Circle and twenty four hours of darkness at the Antarctic Circle.
42 Movements of the Earth Seasons Autumn equinox 22 nd or 23 rd September, the overhead Sun is over the Equator again. The Equator receives the largest amount of solar radiation. On these days the northern hemisphere is in the autumn equinox while the southern hemisphere is in the spring equinox. The angle of the Sun decreases towards the Poles. On these days the two hemispheres receives a similar amount of solar radiation, and the length of day and night is the same as all places on the Earth. Unit 1 After this day it is autumn in the northern hemisphere where the day is shorter than the night. In the southern hemisphere it becomes spring where the day is longer than the night.
43 Movements of the Earth Seasons Winter solstice 21 st or 22 nd the December, the overhead Sun is over the Tropic of Capricorn. It receives the largest amount of solar radiation. On these days the northern hemisphere is in the winter solstice while the southern hemisphere is in the summer solstice. The angle of the Sun decreases towards the poles. Unit 1 On this day the length of daytime in the northern hemisphere is the shortest in the year, while that on the southern hemisphere is the longest in the year. There are 24 hours of darkness at the Artic Circle and 24 hours of daylight at the Antarctic Circle.
44 Movements of the Earth Seasons Unit 1 The Earth have two movements: revolution and rotation Revolution (the earth orbits around the Sun), revolution causes the seasons, equinoxes and solstices Rotation (the earth spins around its own axis) The rotation of the Earth every 24 hours causes day and night The tilt of the axis determine the lenght of the day and night during the different seasons Rotation (North Pole) is anticlockwise (from west to east) so the Sun rises in the east
45 The Earth s natural satellite The Moon The Moon moves in two different ways at he same time: Revolution: around the Earth (lunar orbit), it takes 28 days Rotation: around its own axis, which also takes 28 days Unit 1
46 The Earth s natural satellite The Moon Why the same side of the Moon always faces the Earth? Unit 1
47 Phases of the Moon Unit 1 Each month our Moon passes through eight phases. These phases are named after how much of the moon we can see, and whether the amount visible is increasing, or decreasing
48 Tides Tides occur due to the attraction between the Earth and the Moon, and between the Earth and the Sun.
49 Tides Spring tides The Sun, the Earth and the Moon are in a straight line New Moon days and full Moon days (two times a month) The water rise very high
50 Tides Spring tides The Sun, the Earth and the Moon are in a straight line New Moon days (the water rise very high) Full Moon days (the water fall very low) Two times a month About every two weeks, the positions of the sun, moon, and Earth forma straight line (Figure A). At these times of new and full moon phases as viewed from Earth, the lunar- and solar-related ocean bulges also line up (and add up) to produce tides having the greatest monthly tidal range (that is, the highest high tide and lowest low tide); these are called spring tides.
51 Tides Neap tides Quarter Moon days The Sun, The Moon, and the Earth are in right angle Neither rise very high nor fall very low
52 Tides Neap tides Quarter Moon days The Sun, The Moon, and the Earth are in right angle Neither rise very high nor fall very low Between spring tides, at the first and third quarter phases of the moon, the sun's pull on Earth is at right angles to the pull of the moon (Figure B). At this time, tides have their minimum monthly tidal range (that is, unusually low high tide and unusually high low tide); these are called neap tides or fortnightly tides. Furthermore, the moon orbits Earth in an ellipse (rather than a circle) so that the moon is closest to Earth
53 Eclipses Solar eclipse: the Moon passes between the Sun and the Earth, and blocks off the sunlight.
54 Eclipses The bright dancing lights of the aurora are Lunar eclipse: the Moon passes behind the Earth prevents sunlight from reaching the Moon
55 The Northern Lights The bright dancing lights of the aurora are actually collisions between electrically charged particles from the sun that enter the earth's atmosphere. The lights are seen above the magnetic poles of the northern and southern hemispheres. They are known as 'Aurora borealis' in the north and 'Aurora australis' in the south..
56 Unit 1 THE END
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