Why Does the Saturn Nebula Appear Greenish-Yellowish in Small Telescopes?

💡 The Answer

• The nebula's greenish-yellowish hue is visible in small amateur telescopes.
• This color comes from ionized gases excited by the central white dwarf star.
• Specifically, doubly ionized oxygen (O III) emits green light.
• The exact shade depends on the telescope's optics and observation conditions.