Chapter 10 Section 2


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Chapter 10 Section 2

  1. 1. Chapter 10 Section 2 A Solar System is born
  2. 2. Our Solar System <ul><li>Our solar system consists of 9 (10) planets, the sun and many moons and small bodies (comets, meteors, etc) </li></ul>
  3. 3. The Solar Nebula <ul><li>Nebulas are found in the regions of space between the stars. </li></ul><ul><li>Nebulas are mixtures of gas and dust. </li></ul><ul><li>The gasses of nebulas is mostly from Hydrogen and Helium. </li></ul>
  4. 4. Interstellar Medium <ul><li>The inter stellar medium, matter of a nebula, is held together by the force of gravity. </li></ul><ul><li>The outward pressure balances with the inner gravitational pull to keep a nebula from collapsing. </li></ul>
  5. 5. Collapsing Nebulas <ul><li>The balance between gravity and pressure in a nebula can be upset if two nebulas collide or if a star explodes. </li></ul><ul><li>When a nebula collapses, small areas in the cloud called globules are pushed together. </li></ul>
  6. 6. Collapsing… <ul><li>As a solar nebula collapses, the attraction between the particles would grow stronger. </li></ul><ul><li>The center of the collapsed cloud of gas and dust would become very dense and hot. </li></ul>
  7. 7. <ul><li>The measure of the average kinetic energy in a substance is known as temperature. </li></ul><ul><li>Over time, the nebula will become flattened into a rotating disk </li></ul>
  8. 8. Planetesimals <ul><li>In a solar nebula, bits of dust collided and stuck together to form small bodies. </li></ul><ul><li>The largest of these colliding bodies are called planetesimals, or small bodies. </li></ul>
  9. 9. Gas Giants <ul><li>The largest planetisimals were far enough away from the solar nebula to attract nebula gases. </li></ul><ul><li>The planets J,S, U , N are called gas giants. </li></ul>
  10. 10. The Sun is born <ul><li>When the gas in the nebula’s center stopped collapsing, our Sun was born. </li></ul>
  11. 11. Events in Order <ul><li>1. The solar nebula began to collapse. </li></ul><ul><li>2. The solar nebula rotates and flattens. It grew warmer near its center. </li></ul>
  12. 12. Events Cont’d <ul><li>3. Planetesimals began to form. </li></ul><ul><li>4. The largest of the Planetesimals grew in size and attracted more gas and dust. </li></ul>
  13. 13. The end of the events <ul><li>5. Planets began to grow as planetismals collided with one another. </li></ul><ul><li>6. The sun was born. The remaining gas and dust were removed from the solar system. </li></ul>
  14. 14. Inner Planets <ul><li>The inner planets of our solar system are mostly rocky. They are M,V,E,M. </li></ul><ul><li>After the planets were formed, the center mass of the solar nebula became so dense and hot it formed Helium. </li></ul>