Hi sandy,It appears that the theory is not that well supported at all, mainly I think because of its Biblical implications.However, hydrocarbons such as ethane and methane have been found in cometary tails such as comet Hyakutake <a href="http://www.windows.ucar.edu/tour/link=/">http://www.windows.ucar.edu/tour/link=/</a> ... utake.html and carbon signatures 'C-H' in Halley's comet.