Astrochemistry, including: Carl Sagan, Timeline Of Knowledge About The Interstellar And Intergalactic Medium, Interstellar Medium, Cosmochemistry, ... Elements, Tholin, Hydrogen Line, Chon

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More info: Astrochemistry, the overlap of astronomy and chemistry, is the study of the abundance and reactions of chemical elements and molecules in the universe, and their interaction with radiation. The word "astrochemistry" may be applied to both the Solar System and the interstellar medium. The study of the abundance of elements and isotope ratios in Solar System objects, such as meteorites, is also called cosmochemistry, while the study of interstellar atoms and molecules and their interaction with radiation is sometimes also called molecular astrophysics. The formation, atomic and chemical composition, evolution and fate of molecular gas clouds is of special interest, because it is from these clouds that solar systems form.