Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Interstellar_medium> ?p ?o }
- Interstellar_medium abstract "In astronomy, the interstellar medium (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, as well as 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 interstellar medium is composed primarily by hydrogen followed by helium with trace amounts of carbon, oxygen, and nitrogen comparatively to hydrogen. 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 1019 molecules per cm3 for air, and 1010 molecules per cm3 for a laboratory high-vacuum chamber. By mass, 99% of the ISM is gas in any form, and 1% is dust. Of the gas in the ISM, by number 91% of atoms are hydrogen and 9% are helium, with 0.1% being atoms of elements heavier than hydrogen or helium, known as "metals" in astronomical parlance. By mass this amounts to 70% hydrogen, 28% helium, and 1.5% heavier elements. The hydrogen and helium are primarily a result of primordial nucleosynthesis, while the heavier elements in the ISM are mostly 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 artificial 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 norwegianaurorap01chririch.
- Interstellar_medium wikiPageExternalLink 0000099.000.html.
- Interstellar_medium wikiPageExternalLink intro.html.
- Interstellar_medium wikiPageExternalLink wham.
- Interstellar_medium wikiPageExternalLink pahdb.
- Interstellar_medium wikiPageExternalLink 64.
- Interstellar_medium wikiPageID "69453".
- Interstellar_medium wikiPageLength "32883".
- Interstellar_medium wikiPageOutDegree "222".
- Interstellar_medium wikiPageRevisionID "681109880".
- Interstellar_medium wikiPageWikiLink Abiogenesis.
- Interstellar_medium wikiPageWikiLink Absorption_spectroscopy.
- Interstellar_medium wikiPageWikiLink Absorption_spectrum.
- Interstellar_medium wikiPageWikiLink Aether_(classical_element).
- Interstellar_medium wikiPageWikiLink Alnilam.
- Interstellar_medium wikiPageWikiLink Alnitak.
- Interstellar_medium wikiPageWikiLink Amino_acid.
- Interstellar_medium wikiPageWikiLink Amino_acids.
- Interstellar_medium wikiPageWikiLink Astronomical_unit.
- Interstellar_medium wikiPageWikiLink Astronomy.
- Interstellar_medium wikiPageWikiLink Astrophysical_maser.
- Interstellar_medium wikiPageWikiLink Astrophysics.
- Interstellar_medium wikiPageWikiLink Atom.
- Interstellar_medium wikiPageWikiLink Beta_Scorpii.
- Interstellar_medium wikiPageWikiLink Big_Bang.
- Interstellar_medium wikiPageWikiLink Big_Bang_nucleosynthesis.
- Interstellar_medium wikiPageWikiLink Binary_star.
- Interstellar_medium wikiPageWikiLink Blueshift.
- Interstellar_medium wikiPageWikiLink Calcium.
- Interstellar_medium wikiPageWikiLink Carbon.
- Interstellar_medium wikiPageWikiLink Category:Articles_containing_video_clips.
- Interstellar_medium wikiPageWikiLink Category:Astrochemistry.
- Interstellar_medium wikiPageWikiLink Category:Interstellar_media.
- Interstellar_medium wikiPageWikiLink Category:Outer_space.
- Interstellar_medium wikiPageWikiLink Cosmic_dust.
- Interstellar_medium wikiPageWikiLink Cosmic_ray.
- Interstellar_medium wikiPageWikiLink Cosmic_rays.
- Interstellar_medium wikiPageWikiLink Coulomb.
- Interstellar_medium wikiPageWikiLink DNA.
- Interstellar_medium wikiPageWikiLink Dark_nebula.
- Interstellar_medium wikiPageWikiLink Delta_Orionis.
- Interstellar_medium wikiPageWikiLink Density.
- Interstellar_medium wikiPageWikiLink Diffuse_interstellar_band.
- Interstellar_medium wikiPageWikiLink Diffuse_interstellar_bands.
- Interstellar_medium wikiPageWikiLink Dispersion_(optics).
- Interstellar_medium wikiPageWikiLink Doppler_Effect.
- Interstellar_medium wikiPageWikiLink Doppler_effect.
- Interstellar_medium wikiPageWikiLink Dynamics_(mechanics).
- Interstellar_medium wikiPageWikiLink Edward_Emerson_Barnard.
- Interstellar_medium wikiPageWikiLink Electromagnetic_radiation.
- Interstellar_medium wikiPageWikiLink Electromagnetic_theory.
- Interstellar_medium wikiPageWikiLink Electron.
- Interstellar_medium wikiPageWikiLink Electronvolt.
- Interstellar_medium wikiPageWikiLink Energy.
- Interstellar_medium wikiPageWikiLink Energy_level.
- Interstellar_medium wikiPageWikiLink Epicureanism.
- Interstellar_medium wikiPageWikiLink Epsilon_Orionis.
- Interstellar_medium wikiPageWikiLink Exoplanet.
- Interstellar_medium wikiPageWikiLink Exoplanets.
- Interstellar_medium wikiPageWikiLink Extinction_(astronomy).
- Interstellar_medium wikiPageWikiLink Extremely_high_frequency.
- Interstellar_medium wikiPageWikiLink Far_ultraviolet.
- Interstellar_medium wikiPageWikiLink Fossil_stellar_magnetic_field.
- Interstellar_medium wikiPageWikiLink Galactic_corona.
- Interstellar_medium wikiPageWikiLink Galaxy.
- Interstellar_medium wikiPageWikiLink Gas.
- Interstellar_medium wikiPageWikiLink Gravitational_collapse.
- Interstellar_medium wikiPageWikiLink H-alpha.
- Interstellar_medium wikiPageWikiLink HII_region.
- Interstellar_medium wikiPageWikiLink H_II_region.
- Interstellar_medium wikiPageWikiLink Heliopause_(astronomy).
- Interstellar_medium wikiPageWikiLink Heliosheath.
- Interstellar_medium wikiPageWikiLink Heliosphere.
- Interstellar_medium wikiPageWikiLink Helium.
- Interstellar_medium wikiPageWikiLink Hydrogen.
- Interstellar_medium wikiPageWikiLink Hydrogen_line.
- Interstellar_medium wikiPageWikiLink Hydrogenation.
- Interstellar_medium wikiPageWikiLink Hydroxylation.
- Interstellar_medium wikiPageWikiLink Hα.
- Interstellar_medium wikiPageWikiLink Infrared.
- Interstellar_medium wikiPageWikiLink Infrared_astronomy.
- Interstellar_medium wikiPageWikiLink Interplanetary_medium.
- Interstellar_medium wikiPageWikiLink Interstellar_ice.
- Interstellar_medium wikiPageWikiLink Interstellar_reddening.
- Interstellar_medium wikiPageWikiLink Ion.
- Interstellar_medium wikiPageWikiLink Jacobus_Kapteyn.
- Interstellar_medium wikiPageWikiLink Johannes_Franz_Hartmann.
- Interstellar_medium wikiPageWikiLink Kelvin.
- Interstellar_medium wikiPageWikiLink Kinetic_energy.
- Interstellar_medium wikiPageWikiLink Kristian_Birkeland.
- Interstellar_medium wikiPageWikiLink Life.
- Interstellar_medium wikiPageWikiLink List_of_interstellar_and_circumstellar_molecules.
- Interstellar_medium wikiPageWikiLink List_of_plasma_(physics)_articles.
- Interstellar_medium wikiPageWikiLink Local_Bubble.
- Interstellar_medium wikiPageWikiLink Local_Interstellar_Cloud.
- Interstellar_medium wikiPageWikiLink Luminiferous_aether.
- Interstellar_medium wikiPageWikiLink Lyman_series.
- Interstellar_medium wikiPageWikiLink Magnetic_field.