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The Planet Earth


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The Planet Earth
Chapter 22

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The Planet Earth

  1. 1. Chapter 22THE PLANET EARTH
  2. 2. EARTH• The shape of the Earth approximates an oblate spheroid, a sphere flattened along the axis from pole to pole such that there is a bulge around the equator
  3. 3. Rotates on its axis 23h and 56minRevolves around the sun in 365 ¼ daysHas 1 moonJuly 20,1969 – 1st man landed on the moon ( Neil Armstrong )
  4. 4. Phases of the moon
  5. 5. Eclipse -• Solar eclipse – occurs when the moon passes between the earth and the sun
  6. 6. Lunar eclipse – occurs when the earth passes between the moon and the sun
  7. 7. Solar system
  8. 8. Stars – made –up of hydrogen and helium• Types:• 1. supergiant ------ 1000 x the diameter of sun• 2. giant ----- 10 – 100x• 3. medium – sized – 1/10 – 10x• 4. white dwarf --- ½ diameter of earth• 5. neutron ---- 16 km smaller than earth• Spectroscope – instrument used to study the composition and brightness of the stars
  9. 9. Constellations – groups of stars whose patterns were perceived by ancient people as imaginary figures• Big dipper
  10. 10. Asteroids – small bodies in orbit around the sun
  11. 11. A comet is an icy body that releases gas or dust. They are often compared to dirty snowballs.• As a comet gets closer to the sun, the ice on the surface of the nucleus begins turning into gas, forming a cloud known as the coma. Radiation from the sun pushes dust particles away from the coma, forming a dust tail, while charged particles from the sun convert some of the comets gases into ions, forming an ion tail. Since comet tails are shaped by sunlight and the solar wind, they always point away from the sun.