Presentation on theme: "Impact. The Solar System Nine Eight Planets Over 100,000 catalogued asteroids ???? Centaurs ???? KBO’s (including one disgruntled ex- planet) Millions."— Presentation transcript:
Meteo-Wrongs Meteorites Never: – Have internal cavities – Have layers – Have veins – Flatten on impact – Mold around objects – Almost never light in color outside If you “think” it’s magnetic, it’s not magnetic
Tektites Very silica-rich, water poor glassy rocks Terrestrial vs. Extraterrestrial origin? Volcanic vs. Impact origin? Problems: – Odd chemistry – If terrestrial, why are they spread so widely? – If extraterrestrial, why are they so localized? Now considered impact glass – Atmospheric shock wave evacuates atmosphere
What happens during impact Atmospheric entry – Microscopic objects gradually decelerate – Millimeter-sized objects vaporize, seen as meteors – Meter-sized objects may fragment and survive passage – House-sized objects hit with force Contact-compression phase Transient crater phase Rebound and collapse phase
Impact Processes Impact releases kinetic energy instantaneously – Explosion Explosion scaling: Volume proportional to energy – Radius scales as cube root of energy Energy Measures – Kiloton = 4.2 x 10 12 Joules = 10 12 calories – Megaton = 4.2 x 10 15 Joules = 10 15 calories – Note: Small “c” calories
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