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reply to post by AQ6666
Thats so cool! The only ones i've seen so far were very small high up and despaired in seconds
A reason for chem trails? could be fought on this maybe they cover the sky so we cant see whats going on?
or notedit on 28-9-2013 by hknudzkknexnt because: (no reason given)
What "magnetic interferences?" While there is a very, very, very, very remote possibility that another object might collide with a comet the chance that such an event would change the orbit such that it would impact Earth is even more remote. And C/2012 S1 (ISON) will never be near Earth in the first place.
I`m far from being an expert on this subject, but I believe NASA can`t predict a lot of possible situations that may happen such as magnetic interferences and/or crashes with other asteroids in space that can change ISON trajectory and if this happens near Earth we can all be surprised without even a warning.
Based upon photographic fireball studies, cometary meteoroids have extremely low densities, about 0.8 grams/cc for class IIIA fireballs, and 0.3 grams/cc for class IIIB fireballs. This composition is very fragile and vaporizes so readily when entering the atmosphere, that it is called “friable” material. These meteoroids have virtually no chance of making it to the ground unless an extremely large piece of the comet enters the atmosphere, in which case it would very likely explode at some point in its flight, due to mechanical and thermal stresses.