Exploring the structure of the Milky Way with O/B Associations
O/B Associations
Distances to O/B Associations determined using Cepheid variables
O/B Associations trace out 3 spiral arms near the sun.
Text Box: Sagittarius arm
Sagittarius arm
Text Box: Orion-Cygnus arm
Orion-Cygnus arm
Text Box: Perseus arm
Perseus arm
Sun
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