In the Hubble Palette ($ ext{SHO}$), which element's emission is mapped to the Blue channel?
Answer
Oxygen ($ ext{OIII}$)
The Hubble Palette technique maps Sulfur ($ ext{SII}$) to Red, Hydrogen-alpha ($ ext{H} ext{alpha}$) to Green, and Oxygen ($ ext{OIII}$) to Blue to visually separate the different gas structures.
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