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  2. Atomic and molecular astrophysics - Wikipedia

    en.wikipedia.org/wiki/Atomic_and_molecular...

    Atomic physics plays a key role in astrophysics as astronomers' only information about a particular object comes through the light that it emits, and this light arises through atomic transitions. Molecular astrophysics , developed into a rigorous field of investigation by theoretical astrochemist Alexander Dalgarno beginning in 1967, concerns ...

  3. List of interstellar and circumstellar molecules - Wikipedia

    en.wikipedia.org/wiki/List_of_interstellar_and...

    For example, radio astronomy is most sensitive to small linear molecules with a high molecular dipole. [3] The most common molecule in the Universe, H 2 ( molecular hydrogen ), is completely invisible to radio telescopes because it has no dipole; [ 3 ] its electronic transitions are too energetic for optical telescopes, so detection of H 2 ...

  4. Astrochemistry - Wikipedia

    en.wikipedia.org/wiki/Astrochemistry

    For this reason, molecules and molecular ions which are unstable on Earth can be highly abundant in space, for example the H 3 + ion. Astrochemistry overlaps with astrophysics and nuclear physics in characterizing the nuclear reactions which occur in stars, as well as the structure of stellar interiors.

  5. List of online music databases - Wikipedia

    en.wikipedia.org/wiki/List_of_online_music_databases

    Below is a table of online music databases that are largely free of charge. Many of the sites provide a specialized service or focus on a particular music genre . Some of these operate as an online music store or purchase referral service in some capacity.

  6. Astrophysics Data System - Wikipedia

    en.wikipedia.org/wiki/Astrophysics_Data_System

    The database initially contained only astronomical references, but has now grown to incorporate three databases, covering astronomy references (including planetary sciences and solar physics), physics references (including instrumentation and geosciences), as well as preprints of scientific papers from arXiv. The astronomy database is by far ...

  7. List of academic databases and search engines - Wikipedia

    en.wikipedia.org/wiki/List_of_academic_databases...

    A database of biomedical and life sciences literature with access to full-text research articles and citations. [56] Includes text-mining tools and links to external molecular and medical data sets. A partner in PMC International. [57] Free EMBL-EBI [58] FSTA – Food Science and Technology Abstracts: Food science, Food technology, Nutrition

  8. Astrophysics - Wikipedia

    en.wikipedia.org/wiki/Astrophysics

    Astrophysics is a science that employs the methods and principles of physics and chemistry in the study of astronomical objects and phenomena. [1] [2] As one of the founders of the discipline, James Keeler, said, astrophysics "seeks to ascertain the nature of the heavenly bodies, rather than their positions or motions in space—what they are, rather than where they are", [3] which is studied ...

  9. Molecular cloud - Wikipedia

    en.wikipedia.org/wiki/Molecular_cloud

    A molecular cloud, sometimes called a stellar nursery (if star formation is occurring within), is a type of interstellar cloud, the density and size of which permit absorption nebulae, the formation of molecules (most commonly molecular hydrogen, H 2), and the formation of H II regions.