Comet and Asteroid Impacts Impact of Comet Shoemaker

Impact of Comet Shoemaker. Levy on Jupiter

Major Impacts on Earth Comets and asteroids do hit the earth periodically. (But not

What was the size of the asteroid that killed the dinosaurs? A (too small

Why are comet and asteroid collisions so destructive? Energy m v 2 10 km

Which of the following is true about our solar system? A) contains more large

Near-Earth asteroid: Aphophis (2004 MN 4) • Close encounter with Earth on April 13,

The asteroid depicted in the previous video had a diameter of 500 km. How

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Comet and Asteroid Impacts

Impact of Comet Shoemaker. Levy on Jupiter

Major Impacts on Earth Comets and asteroids do hit the earth periodically. (But not nearly as often as they used to. ) The last big impact was in Tunguska, Siberia in 1908. Everything was destroyed within 30 km.

Major Impacts on Earth

What was the size of the asteroid that killed the dinosaurs? A (too small to see) B C D

Why are comet and asteroid collisions so destructive? Energy m v 2 10 km asteroid at 1 m/s: Energy = 0. 03 megatons 10 km asteroid at 20, 000 m/s: Energy = 10, 000 megatons !

Which of the following is true about our solar system? A) contains more large asteroids/comets than small ones B) contains more small asteroids/comets than large ones C) contains equal numbers at all sizes

Frequency of Impacts

Near-Earth asteroid: Aphophis (2004 MN 4) • Close encounter with Earth on April 13, 2029 (Friday the 13 th) • Will be within 20, 000 miles of Earth • Rare event; once every 1, 000 years • Chance of impact in 2029 was 1/30, but now very low • Diameter = 300 meters; catastrophic on regional scale

The asteroid depicted in the previous video had a diameter of 500 km. How many asteroids are that size or larger? A) B) C) D) E) F) G) 3 30 3000 30, 000