Earth science 23.4

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Earth science 23.4

  1. 1. 23.4 Minor Members of the Solar System<br />
  2. 2. Asteroid<br />A small, rocky body, which can range in size from a few hundred kilometers to less than a kilometer; the asteroids’ orbits lie mainly between those of Mars and Jupiter. <br />
  3. 3. Comet <br />A small body made of rocky and metallic pieces held together by frozen gases; comets generally revolve about the sun in an elongated orbit.<br />
  4. 4. Coma<br />The fuzzy, gaseous component of a comet’s head.<br />
  5. 5. Meteoroid <br />A small, solid particle that travels through space.<br />
  6. 6. Meteor<br />The luminous phenomenon observed when a meteoroid enters Earth’s atmosphere and burns up popularly called a shooting star.<br />
  7. 7. Meteorite<br />Any portion of a meteoroid that reaches Earth’s surface.<br />
  8. 8. Key Concept<br />Most asteroids lie between the orbits of Mars and Jupiter. They have orbital periods of three to six years.<br />
  9. 9. Key Concept<br />A small growing nucleus with a diameter of only a few kilometers can sometimes be detected within a coma. As comets approach the sun, some, but not all, develop a trail that extends for millions of kilometers.<br />
  10. 10. Key Concept<br />Most meteoroids originate from any one of the following three sources: (1) interplanetary debris that was not gravitationally swept up by the planets during the formation of the solar system, (2) material from the asteroid belt, or (3) the solid remains of comets that once traveled near Earth’s orbit.<br />

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