What process causes Emission Nebulae to glow vibrantly, often showing a reddish color?
Answer
Recombination of electrons with hydrogen nuclei after ionization by UV radiation
Emission Nebulae achieve their vibrant glow through a specific atomic process involving intense ultraviolet radiation emitted by nearby, hot, young stars. This high-energy radiation strips electrons from the hydrogen atoms within the gas, a process known as ionization. When these freed electrons subsequently recombine with the hydrogen nuclei, they release energy in the form of light, causing the cloud to shine brightly. The characteristic reddish-pink hue often observed is the signature fingerprint of this excited hydrogen gas.
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