1. Christine Lee 9 The Universe and the Stars

3. 4 Gravity

4. 5 Galaxy

5. 6 Constellations

6. 7 Stars

7. 8 Nebula

8. 9 Planets

9. 10 How are stars born?

10. 11 How do stars die?

11. 12 Blue Giants

13. 15 Similarities & Differences

14. 16 Main Sequence

15. 17 Nuclear Fusion

16. 18 Sun Spots, Solar Winds

17. 19 Solar Prominences, Solar Flares

18. 20 Death of our Sun

19. 21 Astronomy

20. 22 Astronomer

21. 23 Ptolemy

23. 26 Comets, Asteroids and Meteoroids

24. 27 How was solar system created?

25. 28 Earth

26. 29 Jupiter

27. 30 References

29. It's continuously expanding

30. Has black holes, planets, stars and everything! We still don't know exactly how and why the universe was created. Many theories are being created by physicists and astronomers. One of the theory was that when equal amounts of antimatter and matter collided, it made big explosions. But if antimatter and matter was equal, how does matter exist in our world? Some people say that there was a little bit more matter than antimatter.

32. This keeps the planets to orbit around the sun.

33. The more mass the objects have, the grater force of gravity! Few physicists believe that gravity is the weakest force in the universe . Gravity can destroy a star, but it's actually not a strong force at all! We can jump , despite the strong force that pulls us towards the ground. The clips will stick to a magnet, off the ground. Interesting, eh?

35. We live in Milky Way Galaxy Milky Way spiral galaxy seen from top Our Solar System Milky Way Galaxy Diameter: 10 million light years approx Thickness: 1.5 million light years approx Our Solar System: 3 million light years away from the centre of galaxy. An elliptical galaxy An irregular galaxy

37. We live in Milky Way Galaxy Milky Way spiral galaxy seen from top Our Solar System Milky Way Galaxy Diameter: 10 million light years approx Thickness: 1.5 million light years approx Our Solar System: 3 million light years away from the centre of galaxy. An elliptical galaxy An irregular galaxy

42. The word planet comes from the Greek word planetes , meaning wanderer. Name Pic Characteristics Physical Characteristics Mercury No atmosphere; big temperature differences Density is big, size and radius small -> Terrestrial Planets Venus The brightest planet seen from Earth. Carbon dioxide atmosphere -> High temp. Mars Has two polar caps on each pole Jupiter Biggest planet in our solar system. Density is small, size and radius big. Has a ring. -> Jovian Planets Saturn Least dense planet -> Less than water Uranus Appears to be turquoise because of methane Neptune Has a black spot.

44. It's an important source of energy for stars because it needs to push outward to keep an equal balance between gravity. Nothing could have existed without chemistry! Hydrogen and helium – the main components of a star, is a very explosive particle. If you put a fire near them, it will explode.

47. A part of nebula with greater density (gravity) gathers other dust particles into one spot.

48. This causes pressure to go up and hydrogen atoms collide against each other -> temperature increases.

49. When the density reaches its limit, nuclear fusion starts and extraordinary amount of energy is released.

50. Protostar A protostar : like a pre-star Our universe is mostly made of the fundamental chemical, 'hydrogen'. But we don't know where it came from.

52. Stars with 8~30 times of our Sun's mass slowly die by creating heavier elements such as oxygen and iron...then it explodes when the pressure is too high for a star.

53. Stars with 30+ time s of our Sun's mass becomes a black hole when it dies.

55. Burns up hydrogen quicker than red dwarfs -> dies earlier than red dwarfs.

57. Lasts longer than blue giants.

59. Orange and medium-hot temperature. The Sun's core can be as hot as 15 million degrees Celsius ! The surface temperature is about 6000 degrees Celsius. The Sun uses more than 30 million truck loads of fuel every second!

61. Lifespan is short

62. Blue

63. Humongous

65. Lifespan is long

66. Red

67. Small

69. Lifespan is medium long

70. Orange

71. Medium

72. In the middle

74. Solar winds are caused by electrically charged particles called ions, emitted into space. Solar Wind. SHhhhhhh~~~ Can you see the little dots on here? It's about 10 times bigger than the earth!

76. Solar flares are 'magnetic storm' on the Sun. It is the bright spots on the Sun and releases highly charged particles. That means its explosion is huge! Gigantic solar flares cause satellite and communication problems Solar prominence seen from an eclipse.

78. Won't happen until next billion years

82. He believed that the universe was geocentric , therefore the Earth was centre of everything and the universe. The Church liked his geocentric idea. Science and religion seemed to fit perfectly well together- the fact that the God created 'us' and that the Earth was the centre of our universe.

84. He published De revolutionibus orbium coelestium – 'On the Revolution of the Celestial Spheres', which claimed that the sun was at the centre of the universe.

85. Heliocentric Copernicus, however, suggested that the Sun was in the centre. The church disliked this because this theory would break apart science and religion.

87. In 1632 he published Dialogue Concerning the Two Great World System s, criticizing the Ptolemaic system.

88. He was warned by the Church to stop spre ading his heliocentric ideas.

89. Comets, Asteroids and Meteoroids Asteroids Comets Meteoroids Small rocks between Mars and Jupiter. Shape and sizes are irregular. Ice melts near Sun and the long 'tail' faces the opposite of the Sun. Rocks that burn and produce light because of friction on Earth's atmosphere.

91. Dusts and gases circles around the sun, which has the most gravity

94. One day Is not 24 hours... it's actually 23 hours 56 minutes and 4 seconds

95. Is mostly made of iron, oxygen and sillicon

97. Has water and land

98. Ozone layer / atmosphere This information must be sealed from aliens – incase they try to invade the Earth!

100. Biggest planet in the solar system

101. One day in Jupiter is 9 hours 55 minutes and 30 seconds

102. Has 4 big moons Callisto Ganymede Europa Io

104. Wikipedia : definition of 'Planet'

105. Read and Understand Science: Grades 4-6+. Heidrich, Delana.

107. B.C Science Probe 9. Ledrew, Barry.

108. I Wonder Why : Big Book Of Knowledge. ISBN 0-7534-1187-3

109. George's Secret Key To The Universe. Hawking, Lucy and Stephen.

110. The Live Science Textbook 2 (Korean). ISBN 89-5862-092-7

111. http://www.enchantedlearning.com/subjects/astronomy/sun/prominences.shtml .

112. http://www.nasa.gov/multimedia/imagegallery/image_feature_1560.html

113. http://blog.naver.com/dhfk8022?Redirect=Log&logNo=40117865004

114. Viewed on December 13, 2010.