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What color will an interstellar gas cloud composed of hydrogen glow?
Wiki User
∙ 8y ago
It all depends on how close stars are to the cloud, and how intense those stars radiate energy.
A nebula will glow with a blue colour if it simply reflects starlight (the blue is from the same mechanism our sky is blue, from the scattering of light). This occurs when a nebula is too far from stars, or the stars are too cool to generate enough radiation to ionize the hydrogen.
Nebula will glow red if they are close enough to stars to absorb energy - that energy is re-emitted by the nebula as red (from the ionization of the hydrogen, which then glows red).
Wiki User
∙ 8y ago
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