Subjects: ORIGIN of the Earth; COSMOCHEMISTRY
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Subjects: COSMOCHEMISTRY; METHANE; TITAN (Satellite)
Subjects: INTERSTELLAR molecules; INTERSTELLAR medium; COSMOCHEMISTRY
Subjects: MOLECULAR clouds; INTERSTELLAR molecules; STAR formation
Subjects: UNIVERSE; EXHIBITIONS; SCIENTIFIC communitySAGAN, Carl, 1934-1996
Subjects: CRYPTOEXPLOSION structures; IMPACT of asteroids with Earth; STRATIGRAPHIC geologyMETEOR Crater (Ariz.); ARIZONA