Which color palette is most prominently featured in the official branding of the International Astronomical Union (IAU), reflecting the organization's focus on cosmic unity?

Astronomy organizations use specific brand colors to represent their missions and cosmic focus. From observatories to space agencies, these visual identities help communicate their purpose to the public and scientific community. This poll tests your knowledge about the distinctive color schemes used by major astronomy institutions and what these colors symbolize in their brand identity.

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Deep blue and gold, representing the night sky and celestial bodies
Red and black, symbolizing the red shift phenomenon and space
Purple and silver, depicting nebulae and stellar formations
Green and white, representing Earth's connection to the cosmos