What element's forbidden transition is typically responsible for the green or teal hues seen in emission nebulae?
Answer
Ionized Oxygen ($ ext{OIII}$)
Green or teal colors in emission nebulae generally signal forbidden transitions occurring in ionized oxygen ($ ext{OIII}$). The Ring Nebula ($ ext{M}57$) is specifically noted for its bright green glow derived from this source.
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