they include the discovery of the first phosphorus molecular species in dense interstellar clouds , the presence of complex organic ions in the dust and gas phase of halley 's coma , the finding of unusual , probably presolar , deuterium-hydrogen ratios in the amino acids of carbonaceous chondrites , and new developments on the chemical evolution of titan , the primitive earth , and early mars .
C0011744
deuterium
C0020275
hydrogen