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For clarification: the H II regions are in the spiral arms, the disk is the approximate plane of the galaxy we rest on with other stars, and the halo is very broad, surrounding the outskirts of the galaxy. Follow @astrophysicsfeed 🌌 tags: #physics #astronomy #astrophysics #space #quantumphysics #feynman #particlephysics #spacetime #stars #galaxies #physicist #mathematics #universe #planets #einstein #time #relativity #newton #lawsofmotion #classicalmechanics #forces #math