# 1UNIT. The Universe. What do you remember? Key language. Content objectives

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1 1UNIT The Universe What do you remember? What are the points of light in this photo? What is the difference between a star and a planet? a moon and a comet? Content objectives In this unit, you will Learn about the characteristics of the Universe Calculate astronomical sizes and distances Analyse the components of the Universe Compare sizes: the Sun and the planets Create a constellation poster Key language Describing Planets are spherical bodies which orbit the Sun. Asteroids are rocky objects which are irregular in shape. Comparing Dwarf planets are smaller than planets. The Earth is larger than Mercury. Giving instructions Study the constellations. Research more about them on the Internet. 8

2 1. What is the Universe like? Scientists developed two different theories to explain what the Universe was like. 1. Find ten words in the word search. Geocentric theory 2 nd century BC: Ptolomy proposed that the Earth was the centre of the Universe. That is, the Sun, Moon and planets orbited the Earth. Heliocentric theory In 1542, Nicolas Copernicus proposed that the Sun was at the centre of the Universe. In 1610, Galileo Galilei invented the telescope, and proved the Heliocentric theory: the planets and stars revolve around the Sun. M P L A N E T S I G R L A A S A L U A T S R P T K N E L T T A E Y S E N A H C L W O H B R X E L A T M S U N Y I Y M O O N L G T K E S W C P A E 2. Imagine an alien friend from another galaxy wants to write to you. Write your galactic address. What makes up the Universe? The Universe is all the matter, energy and space that exists. The Universe is made up of galaxies which contain stars. Stars can have planetary systems made up of planets and satellites. Galaxies are separated by vast spaces. Galaxies are a vast collection of stars, dust and gases, held together by the gravitational attraction between the components. They appear in groups called galaxy clusters. Scientists think the vast spaces between the galaxies are empty. Our galaxy, the Milky Way, belongs to the Local Group galaxy cluster. Stars form when clouds of gases are pulled together by gravitational forces. They are so hot inside that they emit heat and light. A galaxy can have up to five hundred thousand million stars. An enormous cloud of gas and dust, a nebula, surrounds the stars. Planets are bodies which orbit some stars. They do not emit light; they receive light from the star. They make up planetary systems. Our planetary system is the Solar System. It is made up of eight planets and one star, the Sun, as well as moons, comets and asteroids. The Solar System is located on a spiral arm of the Milky Way. Natural satellites orbit some planets. The Earth s natural satellite is the Moon. 9

3 2. How big is the Universe? The Earth seems huge, but, in reality, it is small compared to the Sun. The Sun is only one of the millions of stars in the Milky Way. To imagine the size of the Universe, use these comparisons with everyday objects. Imagine the Sun is the size of a pea. The closest star is another pea, five hundred and forty kilometres away from the first pea. The Earth is like a particle of dust situated two metres away from the first pea. The Milky Way contains one hundred thousand million peas which form a circle with a radius of seven million kilometres. What units of measurement do astronomers use? Astronomical unit (AU). This is the distance from the Earth to the Sun. Approximately 150 million kilometres. Compare the distance of these planets from the Sun: Mercury: 0.4 AU Mars: 1.5 AU Pluto: 39.4 AU Light-year. This is the distance light travels in one year. Light travels 300,000 km in one second or 9.5 trillion km in one year. 3. Express the distance of Mercury, Mars and Pluto from the Sun in kilometres. Mars Mercury Pluto 4. Research the term light-year. Why is it used in astronomy? Did you know that...? Source of light the Sun Centauri, the nearest star Betelgeuse Time to reach the Earth 8 mins. 20 sec 4 light-years 500 light-years The radius of the Sun is 109 times greater than the radius of the Earth. 10

4 terrestrial orbit 3. What makes up the Solar System? The Solar System was formed approximately five thousand million years ago from the gas and dust of a nebula. Our Solar System is made up of the Sun, eight planets with their satellites, dwarf planets and small solar system bodies. The Sun is the central body. The Sun consists mainly of two gases: hydrogen and helium. It is the closest star to Earth. Planets are spherical bodies which revolve around the Sun. They all move in elliptical orbits, held by the gravitational force of the Sun. Planets are much larger than other celestial bodies which orbit the Sun. Mercury, Venus, Earth and Mars are made up mainly of rock. Jupiter, Saturn, Uranus and Neptune are made up mainly of gases. Dwarf planets are spherical bodies which orbit the Sun. They are smaller than planets. Small solar system bodies are other celestial bodies which orbit the Sun. They include asteroids, comets and satellites. Satellites orbit planets and consist of rock. The planets in the Solar System Planet Distance from Sun (AU) Period of rotation Period of revolution Mercury days 88 days Venus days days Earth h 56 mins days Mars h 37 mins 1.88 years Jupiter h 55 mins years Saturn h 40 mins years Uranus h 14 mins years Neptune h 7 mins years 5. Which planet takes the longest to orbit the Sun? is the fastest to orbit the sun? has the longest days? has the shortest days? 6. Why is a day on Venus longer than its year? 7. What is an orbit? 8. What do you call the imaginary plane of the Earth s orbit? How do the planets move? Celestial bodies like the Earth, have two types of movement: Rotation. Celestial bodies spin or rotate on an invisible axis. This invisible line is called the rotational axis. Revolution. Celestial bodies revolve around other celestial bodies. Orbit. A curved path which a celestial body follows in its revolution around another celestial body. The orbit of the Earth around the Sun is an ellipse. ecliptic plane rotational axis of the Moon rotational axis lunar orbit 11

5 Mercury Diameter: 4,880 km Venus Diameter: 12,104 km Earth Diameter: 12,740 km Mars Diameter: 6,794 km 4. Which are the inner planets? The inner planets are the four planets closest to the Sun: Mercury, Venus, the Earth and Mars. The Earth is the only planet that has life on it. The other planets are too hot or too cold. In 2004, the robots Spirit and Opportunity landed on Mars. They investigated the possible existence of water. Did you know that...? Pluto, Ceres and Eris are dwarf planets. Pluto used to be considered a planet. In 2006, the International Union of Astronomers reclassified it as a dwarf planet. Ceres INNER PLANETS Terrestrial or rocky planets: the crust and mantle are made of rock. The core is metallic Mercury Venus Earth Mars Diameter (Earth = 1) Diameter (km) 4,880 12,104 12,740 6,794 Average surface temperature (ºC) 180 to 430 ºC 465 ºC 89 to 58 ºC 82 to 0 ºC Atmosphere none CO 2 N 2 +O 2 CO 2 Satellites Rings no no no no Interesting characteristics the smallest and closest to the Sun rotates in opposite direction the only planet with life very thin atmosphere CO 2 carbon dioxide N 2 O 2 = nitrogen oxygen 12

6 Jupiter Diameter: 142,984 km Saturn Diameter: 120,536 km 5. Which are the outer planets? Jupiter, Saturn, Uranus and Neptune are the four outer planets. They are called gas giants because they consist mainly of gases. Uranus Diameter: 51,118 km Neptune Diameter: 49,492 km Saturn s rings are made up of small particles, mostly ice. OUTER PLANETS Gas giants: they consist mainly of gases Jupiter Saturn Uranus Neptune , ,536 51,118 49, ºC 170 ºC 200 ºC 210 ºC H 2 He H 2 He H 2 He H 2 He yes yes yes yes 9. Which planet has the most satellites? is closest to the Sun? supports life? is the largest in the Solar System? spins on its axis in the opposite direction? largest planet, most satellites H 2 hydrogen system of rings He helium rotational axis is almost horizontal greatest distance from the Sun 10. If you live on Venus, will the Sun rise in the East and set in the West? 13

7 Pluto Neptune Mars Mercury Earth comet Jupiter Venus Saturn Uranus Asteroid belt The Solar System. Observe the elliptic paths of the planets orbits around the Sun. Notice that the orbit of Pluto, a dwarf planet, is more inclined. 6. What are small Solar System bodies? There are two main types: asteroids and comets. They orbit the Sun. Asteroids are rocky objects which are irregular in shape. They can be several hundred kilometres in diameter, but most are only a few metres wide. Asteroids orbit around the Sun. Most of them are between the orbits of Mars and Jupiter. This area is called the asteroid belt. 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. 11. Compare the main characteristics of the inner and outer planets. 12. Describe an inner or outer planet. Your partner will identify it. This inner planet This outer planet The atmosphere is smaller / larger than is the largest / smallest. has (no) is made up of the Earth. satellites. carbon dioxide. helium. Halley s comet has a bright tail. It was named after the English scientist Edmund Halley. He was the first scientist to calculate the orbit of this comet. Halley s comet will next be visible from Earth in

8 Hands on Prepare a constellation poster Constellations are imaginary patterns of bright stars. All societies have invented constellations. The Ancient Greeks invented the constellations we call the twelve signs of the zodiac. There are 88 official constellations. However, most of them do not really look like the mythical figures they represent. The night sky looks different in the Northern and Southern Hemispheres. The position of the constellations changes with the seasons because of the movement of the Earth. Cassiopeia Orion 1. Study these constellations. Which ones can you see in the night sky where you live? Ursa major Gemini The constellation Orion 2. Choose one of the constellations and make a poster. a. Find more information in encyclopedias or on the Internet. b. Draw the constellation, or cut out a drawing or a photo of it. c. Write some sentences about the constellation. Orion represents the hunter. The three stars in the middle are his belt. His sword hangs from his belt. You can see his sword and his bow. 13. Look up the constellation for your sign of the zodiac. a. Find out where and when it is most clearly visible in the sky. Is it in the Northern or the Southern Hemisphere? b. Write the dates associated with this sign. 14. Choose another constellation. Research more about it on the Internet. 15

9 15. Label each diagram with the name of a. a theory of the universe b. the person who proposed the theory. a 16. Make a drawing of the Solar System and label it: the Sun, the inner planets, the outer planets, Pluto and the asteroid belt. 17. Make a timetable of your daily activities on these planets. Give an approximate duration for each. Earth. Rotation: 24 hours Mercury. Rotation: Earth days Jupiter. Rotation: Earth hours b 21. Talk about astronomical distances with a partner. How far away is from? It is km / light-years away. Astronomic distances from the Earth Object Distance space station 300 km weather satellite 36,000 km the Moon 384,000 km the Sun 150,000,000 km Pluto 6,000,000,000 km Alpha Centauri 4 light-years 22. Research the latest astronomic discoveries. Report your findings to the class. 23. This drawing shows the positions of a comet in orbit. When a comet gets close to the Sun, why does it develop a tail? Why does an asteroid not? Duration on Earth Mercury Jupiter 18. What two types of movement do all planets have? Describe them. 19. Describe the composition, temperature and movement of the Sun. 20. Make an illustrated list of the planets. Write them in order: start with the closest one to the Sun. a b c 24. Draw a diagram of the Solar System seen from above. Include the rotation and revolution movements of each planet. 25. Copy and complete to situate the Moon in the Universe: d e f g h The Moon is a satellite of which belongs to the planetary system called. The star of this planetary systems is. It belongs to a galaxy called. This galaxy is part of the galaxy cluster called. 16

10 What should you know? 1 Early concepts Geocentric theory: the Earth is the centre of the Universe. The Sun, Moon, stars and planets revolve around the Earth. Heliocentric theory: the Sun is the centre of the Universe. The Earth, planets and stars revolve around the Sun. Components Galaxies are grouped together in galaxy clusters. Galaxies contain thousands of millions of stars. Stars are massive spherical bodies of gases. Some stars have planetary systems with planets, satellites, asteroids and comets. THE UNIVERSE Units of measurement Astronomical unit (AU): the distance between the Earth and the Sun, about 150 million kilometres. Light-year. The distance that light travels in one year: about 9.5 trillion kilometres. The Solar System The Solar System is the planetary system of our Sun. It consists of: The Sun: a medium-sized star in the Milky Way galaxy. Planets: Inner: Mercury, Venus, Earth and Mars. All are rocky. Outer: Jupiter, Saturn, Uranus, and Neptune. All are gaseous. Dwarf planets: Pluto, Ceres, Eris Natural satellites: celestial bodies which revolve around planets and dwarf planets. Small Solar System bodies Asteroids: small rocky bodies which orbit the Sun. Some form belts. The asteroid belt: a band of asteroids between the orbits of Mars and Jupiter. Comets: masses of ice and rock found beyond the orbit of Pluto. Projects INVESTIGATE: Could Mars support life? First, list the factors that make life possible on Earth. Then, investigate this website: http//solarsystem.nasa.gov/planets/profile.cfm?object=mars WEB TASK: Do you want to visit Mercury, Jupiter or Mars? 17

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