Comets are composed of frozen water, ammonia, and methane, left over from the formation of the solar system. They are created through natural chemical reactions. Other such chemicals that occur naturally include carbon dioxide, sulfur dioxide, nitrous oxide, (laughing gas) potassium chloride, sodium chloride (salt), acetylene, and formaldehyde, methanol. I once read about a nebula which was comprised of 200 proof ethanol alcohol!
Someone should tell Teddy. NASA's funding would be secure for decades!
A large contingent of FR just signed up for space travel.