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- Interstellar_medium abstract "In astronomy, the interstellar medium (or ISM) is the matter that exists in the space between the star systems in a galaxy. This matter includes gas in ionic, atomic, and molecular form, dust, and cosmic rays. It fills interstellar space and blends smoothly into the surrounding intergalactic space. The energy that occupies the same volume, in the form of electromagnetic radiation, is the interstellar radiation field.The interstellar medium is composed of multiple phases, distinguished by whether matter is ionic, atomic, or molecular, and the temperature and density of the matter. The thermal pressures of these phases are in rough equilibrium with one another. Magnetic fields and turbulent motions also provide pressure in the ISM, and are typically more important dynamically than the thermal pressure is.In all phases, the interstellar medium is extremely tenuous by terrestrial standards. In cool, dense regions of the ISM, matter is primarily in molecular form, and reaches number densities of 106 molecules per cm3. In hot, diffuse regions of the ISM, matter is primarily ionized, and the density may be as low as 10−4 ions per cm3. Compare this with a number density of roughly 1022 molecules per cm3 for liquid water. By mass, 99% of the ISM is gas in any form, and 1% is dust. Of the gas in the ISM, 89% of atoms are hydrogen and 9% are helium, with 2% of atoms being elements heavier than hydrogen or helium, which are called "metals" in astronomical parlance. The hydrogen and helium are a result of primordial nucleosynthesis, while the heavier elements in the ISM are a result of enrichment in the process of stellar evolution.The ISM plays a crucial role in astrophysics precisely because of its intermediate role between stellar and galactic scales. Stars form within the densest regions of the ISM, molecular clouds, and replenish the ISM with matter and energy through planetary nebulae, stellar winds, and supernovae. This interplay between stars and the ISM helps determine the rate at which a galaxy depletes its gaseous content, and therefore its lifespan of active star formation.On September 12, 2013, NASA officially announced that Voyager 1 had reached the ISM on August 25, 2012, making it the first manmade object to do so. Interstellar plasma and dust will be studied until the mission's end in 2025.".
- Interstellar_medium thumbnail WHAM_survey.png?width=300.
- Interstellar_medium wikiPageExternalLink 0000099.000.html.
- Interstellar_medium wikiPageExternalLink intro.html.
- Interstellar_medium wikiPageExternalLink norwegianaurorap01chririch.
- Interstellar_medium wikiPageExternalLink wham.
- Interstellar_medium wikiPageExternalLink pahdb.
- Interstellar_medium wikiPageExternalLink 64.
- Interstellar_medium wikiPageID "69453".
- Interstellar_medium wikiPageRevisionID "602712022".
- Interstellar_medium authorlink "Robert Boyle".
- Interstellar_medium first "Robert".
- Interstellar_medium hasPhotoCollection Interstellar_medium.
- Interstellar_medium last "Boyle".
- Interstellar_medium txt "yes".
- Interstellar_medium year "1674".
- Interstellar_medium subject Category:Astrochemistry.
- Interstellar_medium subject Category:Interstellar_media.
- Interstellar_medium subject Category:Outer_space.
- Interstellar_medium comment "In astronomy, the interstellar medium (or ISM) is the matter that exists in the space between the star systems in a galaxy. This matter includes gas in ionic, atomic, and molecular form, dust, and cosmic rays. It fills interstellar space and blends smoothly into the surrounding intergalactic space.".
- Interstellar_medium label "Interstellair medium".
- Interstellar_medium label "Interstellar medium".
- Interstellar_medium label "Interstellare Materie".
- Interstellar_medium label "Medio interestelar".
- Interstellar_medium label "Meio interestelar".
- Interstellar_medium label "Mezzo interstellare".
- Interstellar_medium label "Milieu interstellaire".
- Interstellar_medium label "Ośrodek międzygwiazdowy".
- Interstellar_medium label "Межзвёздная среда".
- Interstellar_medium label "وسط بين نجمي".
- Interstellar_medium label "星間物質".
- Interstellar_medium label "星际物质".
- Interstellar_medium sameAs Mezihvězdné_prostředí.
- Interstellar_medium sameAs Interstellare_Materie.
- Interstellar_medium sameAs Medio_interestelar.
- Interstellar_medium sameAs Izarrarteko_ingurune.
- Interstellar_medium sameAs Milieu_interstellaire.
- Interstellar_medium sameAs Medium_antarbintang.
- Interstellar_medium sameAs Mezzo_interstellare.
- Interstellar_medium sameAs 星間物質.
- Interstellar_medium sameAs 성간매질.
- Interstellar_medium sameAs Interstellair_medium.
- Interstellar_medium sameAs Ośrodek_międzygwiazdowy.
- Interstellar_medium sameAs Meio_interestelar.
- Interstellar_medium sameAs m.0j2nz.
- Interstellar_medium sameAs Q41872.
- Interstellar_medium sameAs Q41872.
- Interstellar_medium wasDerivedFrom Interstellar_medium?oldid=602712022.
- Interstellar_medium depiction WHAM_survey.png.
- Interstellar_medium isPrimaryTopicOf Interstellar_medium.
