interstellar medium
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astronomyastrophysicsspacevacuumgasdustplasmahydrogenheliummoleculeatomionelectronprotonphotonradiationnebulacloudprotostarstargalaxymilky waysupernovapulsarquasarblack holegravitydensitypressuretemperaturespectrumwavelengthfrequencyabsorptionemissionopacitymagnetismmagnetic fieldcosmologyuniversevoiddark matterdark energylight yearparsecastronomical unitredshiftblueshiftdoppler effectaccretioncollapsefusionnucleosynthesismetallicitysilicategraphitecarbonoxygennitrogenneonargonshock waveturbulencehydrodynamicsthermodynamicsentropyluminositymagnitudeparallax