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Galaxy vs. home lighting

September 2013: While standard bulbs are phased out, one replacement produces light that doesn't occur naturally in the universe.
RELATED TOPICS: TECHNOLOGY
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Astronomy revolves around light. Some celestial objects emit a single dominating color, like green from ionized oxygen. This paints our eyepiece views of planetary nebulae like the Cat’s Eye (NGC 6543). But much more common is to see a mixture of colors.

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