Unformatted text preview: Emission nebulae , or H II regions , are glowing, ionized clouds of gas and dust grains . Emission nebulae are powered by ultraviolet light that they absorb from nearby hot stars. Recombination – the process in which free electrons and free protons combine to form Hydrogen also generates light in the visible spectrum. Reflection nebula e are produced when starlight is reflected from dust grains in the interstellar medium, producing a characteristic bluish glow. Interstellar Extinction – the process in which the intensity of light from distance stars is reduced as it passes through material in interstellar space. Interstellar Reddening...
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- Fall '10
- Astronomy, Supernova, Interstellar medium, interstellar gas