I have been following the latest Jupiter impact at http://spaceweather.com/
. This is the second large impact during my lifetime, the first being the Comet Shoemaker-Levy impact in 1994. Both of these, had they impacted the Earth, would have been extinction events for most if not all of the multicellular life on this planet.
Here is a link to a good video on what would happen if an object that size impacted Earth:
It certainly gets some people to wax philosophical when discussing this sort of thing; others don't even want to think about it at all. I was wondering if anyone had similar experiences when discussing this event and the idea that the Earth has been and will be hit in the future by such objects. I guess it is one thing to consider an impact 65 million years ago and resultant extinction but it is quite another to consider it happening today, as if our species is somehow special and things like that are "not allowed" to happen to us.