Four Letters Re: Asteroid or Comet Impact in 2012? by Rourke
Jim: I’d like to add some input to the meteor thread. First, there’s a near complete (based on our knowledge) and growing database at: http://www.unb.ca/passc/ImpactDatabase/ that shows the residual effects of quite a few impacts. Megaton range impacts occur surprisingly frequently–about once a century. Tunguska level events (that killed almost everything in 2000 sq miles) occur about every thousand years. I don’t like Deep Impact as a scenario, because I cannot for the life of me see 300 million Americans, not to mention the rest of the world, just accepting that a select few will go into a safe cavern, …