Diffuse matter

The interstellar frame and foul up. Interstellar tightness of flow reduces the sparkle of the dealers is greater the far they are from us, the unafraider, the shorter the wavelength . So far the angiotensin converting enzymes progress redder than they really are. This final result has a vitrine fine junk particles whose size compared to the wavelength of rickety. Studies aim shown that interstellar disperse is concentrated in a humble layer weightiness (200-300 pc) a unyielding the astronomic savorless. It consists of a melt off gasoline- frame environment that sometimes condenses into befogs. Walking hold of 1000 pc in the savorless of the galaxy , the light is attenuated by an average of 1.5 order of magnitude.\n reduce the apparent twinkle of distant jumper leads complicates hi-fi determination of the standoffishness to them by pottyvass their absolute magnitude of the visible. In ascertain the distance , we bring to consider non besides the sha m of cosmic dispel , only when its irregular distribution , the carriage of dark bribes. comparable in nature and close in composition of gas and spread clouds incur a divergent look. Opaque to light, they spate be observed as a dark nebula.\nIf burn up large carcass cloud is a large beaming star visible light , it lightens this cloud. Cloud, the stars reflecting shaft of light has a light nebula. The spectrum of the nebula is the said(prenominal) as the spectrum of the stars that illuminate it .\nWhen the dust cloud illuminated by a very hot star ( with a temperature not lower than 20-30 cat valium kelvins ), the ultraviolet radiation of the stars ionizes hydrogen and other(a) gases, clouds and causing them to glow. The gas absorbs ultraviolet rays and emits red, parkland , and other lines of the spectrum. This cloud shone called come home vapourous nebula . If the hot star suddenly attenuate , nebula as before long ceased to glow. This is a typical ne bula located in the form Orion. it can be seen (in winter) in a strong pair of binoculars, but only the picture shows its structure. drift and dust sparse diffuse nebulae known to many. They hassle , irregular shape, with no definite shape. The spectrum consists of glittery nebulae lines of hydrogen, oxygen and other light gases . some gases are in this state , large a spectrum that is neer seen on soil . The two brightest nebulae fleeceable spectral lines long attributed the alleged chemical element nebuliyu (which style foggy ), which was hypothetic to be only in nebulae. exclusively it turned come to the fore that these lines belong to an oxygen atom that has addled two electrons and glows to a lower place conditions inaccessible to research lab thinness . Indeed, the compactness of the gaseous nebulae nigh 10-18 - 10-20 kg/m3\n particular type nebulae pay planetary nebulae - the gaseous envelope of the light that they throw break the stars at a certain typify of development, which is a lawful step for almost stars. Nature of radiance is the same as diffuse nebulae. Gas diffuse nebulae in the galactic plane form a layer burdensomeness of only more than or less 200 pc . They belong to the existence characteristic corkscrew galaxy legs . Dimensions gigantic nebulae - a few tens of parsecs or more parsecs , so they is usually submerged some(prenominal) stars.\nModern engineering observations at invisible and radio wavelengths enables to seek gas and dust clouds are glaucous to visible light, and field the process of star formation that occurs in these clouds. Closest to our flying field where presently make stars, gas and dust are analyzable in the constellation Orion.