Chapter 24: Section 4 (Other Objects in our Solar System)

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Unit 7: Astronomy
Chapter 24: The Solar System
Section 4: Other Objects in our Solar System

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Chapter 24: Section 4 (Other Objects in our Solar System)

  1. 1. Chapter 24 Section 4: Other Objects in Space
  2. 2. Chapter 24: Section 4 <ul><li>Comets: </li></ul><ul><ul><li>1. Controlled by a star’s gravity </li></ul></ul><ul><ul><li>Travel through planets’ orbits, out of the Solar System, & back in again </li></ul></ul>Pgs. 662 - 666 Halley’s Comet Hale-Bopp Comet
  3. 3. Chapter 24: Section 4 <ul><li>Comets: </li></ul><ul><ul><li>HALLEY’S COMET: Most famous (last seen 1986) </li></ul></ul><ul><ul><ul><li>Returns every 76 years </li></ul></ul></ul><ul><ul><ul><li>Will return in 2062 </li></ul></ul></ul><ul><ul><li>HALE-BOPP: Most recent comet </li></ul></ul><ul><ul><ul><li>Discovered in July 23, 1995 </li></ul></ul></ul><ul><ul><ul><li>Visible from Earth during 1997 </li></ul></ul></ul>Pgs. 662 - 666 Halley’s Comet Hale-Bopp Comet
  4. 4. Chapter 24:Section 4 <ul><li>Comet Composition: </li></ul><ul><ul><li>Dust, rock, frozen methane, ammonia, and water </li></ul></ul><ul><ul><li>Comets normally look like dirty snowballs </li></ul></ul><ul><ul><li>When they get close to stars, they change </li></ul></ul><ul><ul><ul><li>They begin to vaporize & Glow </li></ul></ul></ul><ul><ul><ul><li>Forms a coma (tail) from the nucleus (head) </li></ul></ul></ul><ul><ul><ul><ul><li>Coma: glowing trail of particles </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Always points away from the star </li></ul></ul></ul></ul>
  5. 5. Chapter 24: Section 4 <ul><li>Comet Composition (cont’d) </li></ul><ul><ul><li>Comets eventually break up into space debris </li></ul></ul><ul><ul><li>Oort Cloud: large collection of comets beyond Pluto </li></ul></ul>
  6. 6. Chapter 24: Section 4 <ul><li>C. Meteoroids: chunks of rock </li></ul><ul><ul><li>Randomly moving through space </li></ul></ul><ul><ul><li>Usually leftover comet or asteroid debris </li></ul></ul>
  7. 7. Chapter 24: Section 4 <ul><li>Meteor: Meteoroid that enters Earth’s atmosphere </li></ul><ul><ul><li>Heat up & begin to glow = shooting star </li></ul></ul><ul><ul><li>Most burn up before reaching the surface </li></ul></ul><ul><ul><li>Many meteors at one time = meteor shower </li></ul></ul>
  8. 8. Chapter 24: Section 4 <ul><li>Meteorite: Meteor that does not totally burn up, & strikes the Earth’s surface </li></ul><ul><ul><li>Impact creates a crater </li></ul></ul>
  9. 9. LARGEST METEORITE TO HIT EARTH – Namibia, Africa
  10. 10. Largest US Meteorite – Kansas under 6 feet of earth.
  11. 11. Chapter 24: Section 4 <ul><li>F. Asteroids </li></ul><ul><ul><li>Large rocks located between Mars & Jupiter </li></ul></ul><ul><ul><li>Asteroid belt: Large orbiting ring of asteroids </li></ul></ul><ul><ul><li>Believed to be a planet that never formed </li></ul></ul>
  12. 12. Chapter 24: Section 4 <ul><ul><li>Range in size from dust to Moon size </li></ul></ul><ul><ul><li>Some Named Asteroids: </li></ul></ul><ul><ul><ul><ul><li>Ceres: 940 km (Largest known) </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Pallas: 523 km </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Vesta: 501 km </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Juno: 244 km </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Gaspra & Ida: </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Photographed by Galileo probe </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Ida even has a smaller asteroid orbiting it </li></ul></ul></ul></ul>

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