Doomsday by Comet?
It happened once, can it happen again?
Some say lightning never strikes twice in the same spot, but can this be true about a comet?
About 65 million years ago in the Cretaceous Period, a massive comet hit the planet Earth, ending the 135 Million year reign of the most massive and dominant creatures on earth, the Dinosaurs. So it would bring a person to think, if it can happen to them, can it happen to us?
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Well, in the Yucatán peninsula (which is off the coast of Mexico) a giant asteriod 10 kilometers traveling 30 km per second struck and deviated Earth. This extinction is known as the K-T extinction where the dinosaurs and over 70% of the species on Earth were wiped out. Records show that before this asteroid hit the dinosaurs were thriving and were not declining in abundance.
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What if it happens in the 21 century? Well you would have a good change of surviving if the asteroid is smaller then 1/2 a kilometer, once an asteroid reaches the length of 1 kilometer or more everyone is pretty much gone. After the comet hit it would spew ash and dust into the atmosphere causing a global cooling. At this time most of the planets animal and plant life will die out. Then after a few months, all the ash falls to the ground there will be no plants left to convert the carbon dioxide to oxygen in the atmosphere, This will cause a greenhouse effect on earth and the planet would reach temperatures over 2000 degrees Fahrenheit. Then after a few years of that earth would go back to normal. So it very well could be the end of mankind.
Image via Wikipedia
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