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Impacts of Meteors

Impacts of Meteors. Meteor: Glowing fragments from outside the atmosphere that burn upon entry Meteorite: Piece of rock that strikes earth from space Asteroid: Small solar system bodies orbiting around the sun. Yao Yao Dina Freedman 10.25.11. Meteorites.

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Impacts of Meteors

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  1. Impacts of Meteors • Meteor: Glowing fragments from outside the atmosphere that burn upon entry • Meteorite: Piece of rock that strikes earth from space • Asteroid: Small solar system bodies orbiting around the sun Yao Yao Dina Freedman 10.25.11

  2. Meteorites Velocity: typically 10 to 70 km/s when entering atmosphere Slow down to “almost nothing”, same velocity as an object dropped from a plane Small Reach the ground with high velocity, result in a crater Large Frequency: graph Nelson, 2010

  3. Kinetic Energy and Power • Meteorite Flux =10⁷- 10⁹ kg/year • Escape Velocity= 11 km/s • KE = ½ * 10⁸kg * (1.1*10⁴ m/s)² • =6.05 * 10¹⁵ Joules • Power = 6.05 * 10¹⁵ Joules/ 3.1536 * 10⁷ s • Power=1.92*10⁸ W or 1.92 *10⁵ kW • An average house uses 1.8 kW

  4. 0.1 megatons 10 megatons

  5. Historical Impacts • The KT extinction 65 MYA created the Chicxulub Crater about 180 km in diameter • The 1908 Tunguksa Siberia meteor knocked down trees for about 850 sq. miles but did not leave a crater

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