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Indopedia Main Page FORUM Help ... Log in The Indology CMS In other languages: Deutsch Printable version Wikipedia Article Interstellar medium ज्ञानकोश: - The Indological Knowledgebase The interstellar medium (or ISM ) is a term used in astronomy to describe the rarefied gas and dust that exists between the stars (or their immediate "circumstellar" environment) within a galaxy . The matter normally consists of about 99% gas particles and usually 1% of dust. This compound is usually extremely tenuous, with typical densities ranging from a few single to a few hundreds of a particles per cubic centimeter. Generally the gas is roughly 90% hydrogen and 10% helium, with additional elements (" metals " in astronomical parlance) present in trace amounts. The medium is also responsible for cosmic extinction , namely the decreasing light intensity of a star as the light travels through the medium. This extinction is caused by refraction and absorption of photons in certain wavelengths. For example, the typical absorption wavelength of molecular hydrogen lies at ca. 92nm, n=1, the

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Please Enter Your Search Term Below: only in factbook.org in the entire directory Websearch Directory Dictionary FactBook Wikipedia: Interstellar medium Interstellar medium From Wikipedia, the free encyclopedia. The interstellar medium (or ISM ) is a term used in astronomy to describe the rarefied gas that exists between the stars (or their immediate "circumstellar" environment) within a galaxy . This gas is usually extremely tenuous, with typical densities ranging from a few tens to a few hundredths of a particle per cubic centimeter. Generally the gas is roughly 90% hydrogen and 10% helium, with additional elements (" metals ", in astronomical parlance) present in trace amounts. The interstellar medium is usually divided into three phases , depending on the temperature of the gas: hot (millions of Kelvin ), warm (thousands of Kelvin), and cold (tens of Kelvin). This "three-phase" model of the ISM was initially developed by McKee and Ostriker in a 1977 paper, which has formed the basis for further study over the past quarter-century. The relative proportions of the phases is still a matter of considerable contention in scientific circles. Features prominent in the study of the interstellar medium include molecular clouds, interstellar clouds

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Log in Username:: Password:: Remember my login on this computer Create an account Recent changes Random page Wikia Science Request a new wiki Log in Create an account Gaming ... Discussion Interstellar medium From Space Wiki Jump to: navigation search The distribution of ionized hydrogen (known by astronomers as H II (aitch two) from old spectroscopic terminology) in the parts of the Galactic interstellar medium visible from the Earth's northern hemisphere (from the Wisconsin H-Alpha Mapper Survey) In astronomy , the interstellar medium (or ISM ) is the matter interstellar matter , also abbreviated by ISM ) and energy interstellar radiation field ISRF ) content that exists between the stars within a galaxy . 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 . In turn, 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. The ISM consists of an extremely dilute (by terrestrial standards) plasma gas and dust , consisting of a mixture of ions atoms molecules , larger dust grains electromagnetic radiation cosmic rays , and magnetic fields . The matter consists of about 99% gas and 1% dust by mass. It fills interstellar space. This mixture is usually extremely tenuous, with typical gas densities ranging from a few hundred to a few hundred million particles per cubic meter. As a result of

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Interstellar medium From Wikipedia, the free encyclopedia. In astronomy , the interstellar medium (or ISM ) is the matter and energy content that exists between the stars (or their immediate circumstellar environment) within a galaxy . The ISM plays a crucial role in astrophysics precisely because of its intermediate role between stellar and galactic scales. Stars themselves form within cold regions of the ISM, and replenish the ISM with matter and energy through stellar winds and supernovae . In turn, this interplay between stars and the ISM sets the rate at which a galaxy depletes its gaseous content and therefore determines its lifespan of active star formation. The ISM consists of an extremely dilute (by terrestrial standards) plasma , consisting of a mixture of atoms molecules dust electromagnetic radiation ... cosmic rays , and the magnetic field . The matter normally consists of about 99% gas particles and usually 1% dust. It fills interstellar space. This mixture is usually extremely tenuous, with typical gas densities ranging from a few single to a few hundred particles per cubic centimeter. As a result of primordial nucleosynthesis , the gas is roughly 90% hydrogen and 10% helium , with additional elements (" metals " in astronomical parlance) present in trace amounts.

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