Re: Panspermia
The panspermia people like Sir Hoyle sure have taken the flack over the controversy
theory which also included viruses from space. I believe it was Dr Levin who had his own theories on the subject, which led to many hostile debates on the MSNBC board.
Back to the reason for my headline, it seems predicting the next catastrophic impact varies a lot from who makes the report. I remember reading a NASA survey report that said the next Tunguska size event would be around a 1000 years and an other report (I believe Italian) said in a 100 years.
We need more studies
SteveS