"The false-color Spitzer image reveals a different side of the Trifid Nebula. The Trifid Nebula is a giant star-forming cloud of gas and dust located 5,400 light-years away in the constellation Sagittarius." "The glowing Trifid Nebula is revealed in an infrared view from NASA's Spitzer Space Telescope. The Trifid Nebula is a giant star-forming cloud of gas and dust located 5,400 light-years away in the constellation Sagittarius. "The blue section of the photo - representing a "reflection nebula" - shows light from the newly formed stars in the cosmic nursery being reflected in all directions by the particles of dust made of iron, carbon, silicon and other elements in the interstellar cloud." Infrareds This region of sky includes glowing red clouds of mostly hydrogen gas, blue regions where starlight is being reflected from tiny particles of dust and also dark regions where the dust is thick and opaque." "The Danish 1.54-metre telescope located at ESO’s La Silla Observatory in Chile has captured a striking image of NGC 6559, an object that showcases the anarchy that reigns when stars form inside an interstellar cloud. This phenomenon is distinct from red shifting because the spectroscopic lines are not shifted to other wavelengths in reddened objects and there is an additional dimming and distortion associated with the phenomenon due to photons being scattered in and out of the line-of-sight. In interstellar astronomy, visible spectra can appear redder due to scattering processes in a phenomenon referred to as interstellar reddening - similarly Rayleigh scattering causes the atmospheric reddening of the Sun seen in the sunrise or sunset and causes the rest of the sky to have a blue color. These general characteristics of ERE constrain the photoluminescence (PL) band and efficiency for laboratory analysis of dust analog materials." the wavelength of peak emission is longer and the efficiency of the luminescence is lower, the harder and denser the illuminating radiation field is 13. The band is confined between 540-950 nm, but the wavelength of peak emission varies from environment to environment, even within a given object. "The broad, 60 < FWHM < 100 nm, featureless luminescence band known as extended red emission (ERE) is seen in such diverse dusty astrophysical environments as reflection nebulae 17, planetary nebulae 3, HII regions (Orion) 12, a Nova 11, Galactic cirrus 14, a dark nebula 7, Galaxies 8,6 and the diffuse interstellar medium (ISM) 4. silicon nanoparticles provide the best match to the spectrum and the efficiency requirement of the ERE." "he extended red emission (ERE) observed in many dusty astronomical environments, in particular, the diffuse interstellar medium of the Galaxy. This region of sky includes glowing red clouds of mostly hydrogen gas.
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