[QUOTE=Bruggen 130;1639843]

Now it would be foolish for me to argue with the likes of Carl Sagen! 😀 But…

…taking the ‘first few hundred million years’ of Earth’s history as 1000,000,000 years then 3,000,000,000,000,000 tons of comets (water) is going to be arriving at a rate of 3,000,000 tons a year!

Wasn’t the Tunguska explosion in Siberia in 1908 that flattened 2000 square kilometres of forest supposed to be a comet (estimated as ‘a few tens of metres’ across)? So, I’m sure we’d notice 3,000,000 tons of comets arriving every year! :diablo:

So when did that all stop? :confused:

Obviously the rate of comet impact must have slowed, so that begs the question why?

It all stopped a few billion years ago , but when the solar system was forming
5 billion years ago our little part of the universe was a very violent place.

the russian explosion you mention is now being reccognised as an arial explosion rather than an impact the reason why the devastation spread so far !!