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Originally Posted by After Shock Media
D what has been pretty much been mapped?
I think we are at around 5% mapped to date, maybe a few percent more. Then there are still fairly large asteroids within range that can easily be slightly knocked off of balance or rotation. That also says nothing of any deep comets. Since one thing is very certain, Earth and the moon have been a rotating target that has been hit over and over again.
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Sorry... I should have qualified what I said a bit more.
We've pretty much mapped each asteroid that's of a diameter large enough to cause a cataclysmic event if it were to strike earth. The 5%-or-so we've mapped (you're correct there) are something like 99% of the largest ones.
Granted, a good deal more asteroids could cause some severe damage - especially if it lands in your neighborhood... but, from a planetary perspective, we're feel pretty safe now when it comes to asteroids crashing down on us.
And so we turn our attention to the more random beast in our efforts of science-fiction horror - the Kuiper Belt/Ord Cloud native objects (i.e. comets)
Hope that clears my statement up - sorry to have caused any confusion.