An idea can not be un-scientific.  Methodology can, however.  The arguments against Hoagland's methods of forming conclusions are justified.  Ruling out planetary migration, on the other hand, is unscientific.  The reality is that we are sending ever larger and more sophisticated payloads to Mars.  Assuming technology continues to move forward those payloads will eventually be able to handle life support and such.  The US government thinks they can get people there in the next 15 to 20 years.  Nothing in Physics rules it out.  Your original entry seemed to attempt to criticize his methods (valid) but failed when you muddied the waters with the unscientific implications about what is possible and the totally misplaced Panspermia definition (Hoagland never said anything about that). 28 June 2006