resolution sensitivity spectral analysis allowing identification much greater collection molecules including ethane acetylene water carbon monoxide ref name lewis ref however earth based spectroscopy becomes increasingly difficult remote planets since reflected light sun much dimmer spectroscopic analysis light planets used detect vibrations molecules infrared frequency range constrains abundances elements h c n ref name lewis two elements detected phosphorus gas phosphine ph sub sub germanium germane geh sub sub ref name lewis helium
Natural science Chemistry Geochemistry