Probably the most popular theory right now is the Asteroid Theory. According to this theory a large asteroid or comet collided with Earth about 65 million years ago. Scientists think that such a large collision would throw so much dust into the air that sunlight would not be able to shine and plants and animals would die. The dramatic changes in climate that resulted from this huge collision were too much for the dinosaurs. They were not able to survive.
scientists say its due to an nova blast !!!!!!!!!!!

Answers

2014-04-18T17:45:53+05:30
According to the theory that many people believe, a meteor banged into the earth about 65 million years ago causing great destruction and loss of food which made the dinosaurs extinct.
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2014-04-18T17:54:41+05:30
No body knows the real story but they say it would be due to :
A meteorite shower
Volcanic erupt
climate 
desease
                Or they all may be a factor for dinosaurs extenction.......

                 XD XD XD XD XD XD XD XD XD XD XD XD XD XD XD XD XD
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