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Impact - PowerPoint PPT Presentation


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Impact. The Solar System. Nine Eight Planets Over 170,000 catalogued asteroids ???? Centaurs ???? KBO’s (including one disgruntled ex-planet) Millions of Comets. Impact Mechanics. Energy of motion turns into heat 10-m rock at 20 km/sec = 150 kt = 10 Hiroshima atomic bombs

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PowerPoint Slideshow about 'Impact' - arielle


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Presentation Transcript
the solar system
The Solar System
  • Nine Eight Planets
  • Over 170,000 catalogued asteroids
  • ???? Centaurs
  • ???? KBO’s (including one disgruntled ex-planet)
  • Millions of Comets
impact mechanics
Impact Mechanics
  • Energy of motion turns into heat
  • 10-m rock at 20 km/sec = 150 kt = 10 Hiroshima atomic bombs
  • Energy released in seconds
  • Impacting object destroyed
  • Crater 20-30 times diameter of impacting object
  • Crater is round regardless of approach path
the impact process
The Impact Process
  • Atmospheric Entry
  • Contact-Compression
  • Penetration – Transient Crater
  • Excavation
  • Collapse
comets and planetary history
Comets and Planetary History
  • Superposition
  • Crater Saturation
  • Crater Degradation
recognizing craters on earth
Recognizing Craters on Earth
  • Craters rapidly destroyed by erosion
  • Circular geologic structures
  • Impact melts
  • Impact breccias
  • Shock metamorphism
  • Shatter cones
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