Naturalists at Large: Solar system

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Naturalists at Large: Solar system

  1. 1. E arth S cience An overview of the Solar System
  2. 2. The Sun  The sun is the biggest, brightest, and hottest object in the solar system.  The sun is an ordinary star.  The sun is made of about 70% hydrogen and 28% helium.
  3. 3. Mercury Mercury is solid and is covered with craters. Mercury has almost no atmosphere. Mercury is the eighth largest planet.
  4. 4. Venus  Venus is the sixth largest planet. It’s about three-fourths the size of earth.  The surface is rocky and very hot. The atmosphere completely hides the surface and traps the heat.
  5. 5. Earth Earth is the fifth largest planet and the third from the sun. Liquid covers 71 percent of the Earth’s surface. The Earth has one moon.
  6. 6. Moon
  7. 7. Mars  Mars is the fourth planet from the sun.  Mars has a thin atmosphere that contains mostly carbon dioxide.  Mars has two small moons.
  8. 8. Moons of Mars Phobos Deimos
  9. 9. Jupiter
  10. 10. Jupiter’s Red Spot  The Great Red Spot, a huge storm of swirling gas that has lasted for hundreds of years.  Jupiter does not have a solid surface. The planet is a ball of liquid surrounded by gas.
  11. 11. Moons of Jupiter Jupiter has four large Galilean moons,twelve smaller named moons and twenty-three more recently discovered but notnamed moons.We’ll take a look at the four large Galileanmoons which were first observed byGalileo in 1610.
  12. 12. Io Io is the fifth moon of Jupiter. It’s the third largest of Jupiter’s moons. Io has hundreds of volcanic calderas. Some of the volcanoes are active.
  13. 13. Europa Europa is the sixth of Jupiter’s moons and is the fourth largest. It is slightly smaller than the Earth’s moon. The surface strongly resembles images of sea ice on Earth. There may be a liquid water sea under the crust. Europa is one of the five known moons in the solar system to have an atmosphere.
  14. 14. Ganymede Ganymede is the seventh and largest of Jupiter’s known satellites. Ganymede has extensive cratering and an icy crust.
  15. 15. Callisto Callisto is the eighth of Jupiter’s known satellites and the second largest. Callisto has the oldest, most cratered surface of any body yet observed in the solar system.
  16. 16. Saturn Saturn is the second largest planet and the sixth from the sun. Saturn is made of materials that are lighter than water. If you could fit Saturn in a lake, it would float!
  17. 17. Rings of Saturn Saturn’s rings are not solid; they are composed of small countless particles. The rings are very thin. Though they’re 250,000km or more in diameter, they’re less than one kilometer thick.
  18. 18. Uranus Uranus is the third largest planet and the seventh from the sun. Uranus is one of the giant gas planets. Uranus is blue-green because of the methane in its atmosphere.
  19. 19. Neptune Neptune is the fourth largest planet and the eight from the sun. Because of the orbits, from 1979 to 1999, Neptune was the ninth planet. Like Uranus, the methane gives Neptune its color.
  20. 20. Pluto Pluto was the smallest planet and usually the farthest from the sun. (no longer considered a planet) Pluto is now recognized as the largest member of a distinct region called the Kuiper belt.

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