I always remembered Fred Hoyle and N. Chandra Wickramasinghe's book - Diseases from Space, as the first place that I heard about Pan Spermia.
Look here for an article by N.C.W that was posted last year about the supporting evidence. At the time, the whole issue concerning bacilli was that they are the best shape for surviving the passage through the upper atmosphere.
I always remembered Fred Hoyle and N. Chandra Wickramasinghe's book - Diseases from Space, as the first place that I heard about Pan Spermia. Look here for an article by N.C.W that was posted last year about the supporting evidence. At the time, the whole issue concerning bacilli was that they are the best shape for surviving the passage through the upper atmosphere.