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nebulae
hydrogen and helium plasmas. This is really helpful
Because of high temperatures on the Sun
YOU! Really, you are actually radiating light as you read this, though mostly in the submillimeter range (THz) and FIR. Any object with a high enough temperature to transfer photons with other matter is technically luminous, though not always in the visible spectrum and not always according to the blackbody radiation curve. Though if you're speaking more colloquially you may mean luminous as in "Radiating Photons that react with the rods & cones in primate eyes", that is to say luminous within the human visible spectrum, In that case anything that lights up is "luminous"; from the sun and other stars to bioluminescent algae and fishies to hot plasmas like a candle, a campfire, or a forest fire to LEDs, Lasers, Light bulbs and cold plasmas like the pixels in Plasma TV's.
As a nebula is an extremely vast region of space comprised of hydrogen & helium gas, dust and other gases and plasmas, it would be fair to say that they are many, many times larger than even the largest star. Nebulae are often referred to as 'stellar nurseries' as these tend to be regions in which many stars are formed.
nebulae
nebulae
nebulae
Gasses, or plasmas.
Matter. Everything. Gases,Liquids,Solids and Plasmas.
Plasmas are conductive assemblies of charged particles, neutrals and fields that exhibit collective effects. Further, plasmas carry electrical currents and generate magnetic fields. Plasmas are the most common form of matter, comprising more than 99% of the visible universe, and permeate the solar system, interstellar and intergalactic environments. When considered inclusively, it is clear that plasma science and technology encompasses immense diversity, pervasiveness and potential. The future is right for the this plasma features: Plasmas for Home, Business and Transportation Plasmas for Space Plasmas and Manufacturing Plasmas for Energy Plasmas for National Security Plasmas for the Environment Plasmas and Education
the atoms move much slower than in liquids, gases, and plasmas.
Demosthenes Kazanas has written: 'Photon-photon absorption and the uniqueness of the spectra of active galactic nuclei' -- subject(s): Photons, Scattering, Space plasmas
Plasmas do not a have a fixed shape.
No. Plasmas are ionized gas.
Physics of Plasmas was created in 1994.
There are a large number of plasma classifications. These include cold, hot and warm plasmas, plasma ionization, collisional plasmas, neutral plasmas, plasma densities, magnetic plasmas, complex plasmas, active and passive plasmas, ideal and non ideal plasmas and high energy density plasmas.