Panspermia in perspective

Panspermia, an ancient theory, was revived in its modern form by two of the present authors (H-W) in a series of publications over the period 1977 to the present day. Unpopular at first, it is now slowly gaining popularity and is coming to be discussed, albeit with a measure of apprehension, as a serious scientific possibility. A brief resume will be given of the modern scientific case for panspermia, indicating that astronomical, geological and biological evidence is moving slowly in the direction of a paradigm shift.