LYCOS RETRIEVER
Interstellar
built 487 days ago
The Interstellar wars were a series of wars fought between the Terrans and the First Imperium. These wars finally ended with the collapse of the Imperium and the rise of the Second Imperium and the Solomani.
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Interstellar dust is an important constituent of the Galaxy. It obscures all but the relatively nearby regions in visual and ultraviolet wavelengths, and reradiates the absorbed energy in the far-infrared part of the spectrum, thereby providing a major part (~ 30%) of the total luminosity of the Galaxy. The FIR radiation from dust removes the gravitational energy of collapsing clouds, allowing star formation to occur. Dust is crucial for interstellar chemistry by reducing the ultraviolet (UV) radiation which causes molecular dissociations and providing the site of the formation of the most abundant interstellar molecule, H2. Probably grain surfaces are responsible for other chemistry as well. Dust controls the temperature of the interstellar medium (ISM) by accounting for most of the elements which provide cooling, but ... providing heating through electrons ejected photoelectrically from grains.
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Interstellar matter radiates strongly in the infrared. Most of this gas and dust originates from the death of stars which either exploded (supernova) or blew off their outer layers, returning their material to interstellar space. From this material, new stars are formed. Often, the gas and dust between the stars can be detected only in the infrared. By using infrared detectors, astronomers can penetrate the often invisible interstellar gas and dust clouds and gain much information about their composition and structure. Infrared astronomy has ... resulted in the detection of several types of complex interstellar molecules.
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Interactive, Interstellar Fun-- Star Wars trivia contests and games will be held near the Star Tours attraction to test fans' film knowledge. In addition, a special Video Starcade will feature the best in Star Wars-inspired electronic and video games.
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Interstellar dust is produced in the envelopes around red supergiant stars. Stellar winds and the planetary nebula phase eject this dust into the interstellar medium. Dust particles are mostly carbon and silicate grains that are a few microns in size. Although small, they completely absorb any light that strikes them and are heated by collisions with gas molecules. They will be warmed to the ambient temperature of the surrounding region and re-radiate that energy in the far infrared.
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Interstellar dust is not like the dust that you might find under your bed; it is made of very different substances. These dust particles are extremely small, just a fraction of a micron across, which happens to be approximately the wavelength of blue light waves. The particles are irregularly shaped, and are composed of silicates, carbon, ice, and/or iron compounds.
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