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Chapter 9
Chapter 9
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The Solar System



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The Solar System

  3. 3. SOLAR SYSTEM The solar system consists of nine planets, 61 known moons; vast no. of comets, asteroids and meteoroids and interplanetary gas & dust. Large theories suggest that the solar system began 4.6 billion years ago as a spinning cloud of gas & dust that
  4. 4. STARS The sun, a main source of light ,is about five billion years old. It is composed almost entirely of helium and hydrogen .The sun’s surface, the photosphere has temp. of about 5,500 C. The sun mainly has four layers; the core, the photosphere, the corona and the chromosphere.
  5. 5. STARS During the solar eclipse, moon moves in between the sun and the earth. The light from the outer part of the sun’s atmosphere, called the corona becomes visible during the total solar eclipse. In other words , the sun is hidden by the moon . This is known as solar eclipse.
  6. 6. STARS Stars are large celestial composed of gravitationally contained hot gases emitting electromagnetic especially light as a result of nuclear reactions inside the star. Some stars are black hole, supernova ,red giant etc.
  7. 7. Galaxy, collection of stars , low density gases bound together by their own gravity. Galaxies are the building blocks of the universe. The first picture shows the Andromeda galaxy and the second picture shows the Milky way galaxy , in which the solar system is situated.
  8. 8. A planet is a large round object in space that orbits around a star. There are nine planets in solar system. They are: Mercury is the closest planet to the sun. It is a small, rocky planet. Its surface has been heavily cratered by meteorites. It completes one revolution around the sun in 88 days.
  9. 9. Venus is called the morning and the evening star as it is the brightest object in the sky.Venus is the hottest planet of solar system. The fifth largest planet in the solar system is earth. Earth is the only planet which support to life. It is the third nearest planet to the sun.
  10. 10. Mars is the known red planet because of red iron oxide dust that cover its surface. Mars includes the volcano Olympus Mons i.e. the biggest volcano in the solar system. Jupiter is the largest planet in the solar system. It occupies the fifth position in solar system.
  11. 11. Saturn is the sixth planet from the sun and second largest planet in the solar system. Saturn has a beautiful ring system. Uranus is the third largest planet of the solar system. It has 15 moons , 10 rings. It has a blue- green color due to methane.
  12. 12. Neptune is known as the blue planet. It is the fourth largest planet. This planet shows a blue color because of the presence of methane in the atmosphere Pluto is not a planet, it’s a dwarf planet that is located in the outermost of the solar system. That’s why is the farthest planet from Sun.
  13. 13. ASTEROIDS Asteroids are one of the many small or minor planets that move in the elliptical orbits primarily between the orbits of Mars and Jupiter. They also orbits the sun, most of them travel in a between mars and Jupiter. Jupiter’s gravitational pull send asteroids into erratic orbits, causing them to collide with other planets and other asteroids.
  14. 14. COMETS A mass of ice and dust with a long tail, moving around the solar system . Comets look like shooting stars .Here is one example of comet, Halley’s comet . This comet reappears every 76 years. The comet’s orbit which it passes is closest to the sun.
  15. 15. Meteors Meteors are small bodies of matter from outer space that glows like a shooting star. A piece of rock or metal that has fallen to the earth from space is known as a Meteorite. A small body that would become a meteor if it entered the earth’s surface us known as a Meteoroid.