So do conventional theories.
Discovery of abundant, accessible hydrocarbons nearly everywhere in the solar system
Address:http://www.osti.gov/bridge/product.biblio.jsp?osti_id=245547
Abstract analysis of the data gathered during the Comet Halley encounter during 1987 resulted in a body of literature asserting that all comets contain substantial percentages of hydrocarbon solids. These solids appear to have a strong similarity to petrochemicals. Arguments are made that the amount of hydrocarbon material in the accessible comets of the inner Solar system can substantially exceed the known reserves of hydrocarbons on Earth.