On the chemical constitution of cometary nuclei.
D055580:Astronomical Phenomena; D001256:Astronomy; D002248:Carbon Monoxide; D003903:Deuterium; D005557:Formaldehyde; D008697:Methane; D014867:Water
D014867:Water; D005557:Formaldehyde; D002248:Carbon Monoxide; D003903:Deuterium; D008697:Methane