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Astronomy & Telescope Astronomy: Comet and Asteroid

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  Comet and Asteroid Comet and Asteroid: Astronomy: Comet and Asteroid - SEARCHING FOR THE NEXT ONE

SEARCHING FOR THE NEXT ONE

We do not know when Earth will be hit again. Statistically, a 6 mile (10 km) diameter comet—large enough to cause a mass extinction—should strike once every 100 million years. Smaller 1/2 mile (1 km) diameter objects could strike every 100,000 years, and would certainly still be devastating.

 
 
  Posted by astronomy on Wednesday, December 01 @ 15:25:50 CST (9 reads)
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  Comet and Asteroid Comet and Asteroid: Astronomy: Comet and Asteroid - THE RISK OF IMPACT

THE RISK OF IMPACT

Asteroids that remain in the main belt pose no threat to us. However, we know of some 200 asteroids with orbits that cross tlie orbit of Earth, and there are probably 10 times that number we do not know about, as well as an undetermined number of comets. Any of these objects could collide with our planet.

 
 
  Posted by astronomy on Wednesday, December 01 @ 15:24:05 CST (9 reads)
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  Comet and Asteroid Comet and Asteroid: Astronomy: Comet and Asteroid - MASS EXTINCTION

MASS EXTINCTION

If comets can bring life, they can also take it away. Much evidence supports the theory that a comet or asteroid struck the Caribbean basin 65 million years ago. In this scenario, the first result was an incredible earthquake measuring 12 on the Richter scale. Millions of tons of dust surged upward to form a gigantic cloud. The excavated material rushed out with such force that it quickly circled the Earth. For more than an hour, the surface of the Earth was bombarded with this debris, sending temperatures soaring and setting off a global fire-storm. Larger, slow-moving debris landed close to the main crater, in the Gulf of Mexico, creating miles-high tsunamis that devastated the coasts of Mexico and Florida.

 
 
  Posted by astronomy on Wednesday, December 01 @ 15:22:52 CST (8 reads)
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