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the branch of astronomy dealing with the study of molecules in space.


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  • Molecular-beam

    noun, Physics. 1. a stream of molecules freed from a substance, usually a salt, by evaporation and then passed through a narrow slit for focusing, for investigating the properties of nuclei, atoms, and molecules. noun 1. (physics) a parallel beam of molecules that are at low pressure and suffer no interatomic or intermolecular collisions

  • Molecular-biology

    noun 1. the branch of biology that deals with the nature of biological phenomena at the molecular level through the study of DNA and RNA, proteins, and other macromolecules involved in genetic information and cell function, characteristically making use of advanced tools and techniques of separation, manipulation, imaging, and analysis. noun 1. the study of […]

  • Molecular-clock

    noun 1. the changes in the amino acid sequences of proteins that take place during evolution and speciation, and from which the dates of branchings of taxonomic groups can be deduced. noun the rate at which nucleotide (amino acid) substitutions occur in a given DNA (protein) sequence

  • Molecular cloud

    noun 1. a cool dense interstellar region composed of a wide variety of molecules, mainly hydrogen, plus some dust, in which stars are forming noun a large and dense cloud of cold gas and dust in interstellar space from which new stars are formed Examples It is believed that the creation of newborn stars occurs […]

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