The presence of two dominant spiral arms could be explained by __________ ___________ theory.
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Q48: The disk of the Milky Way is
Q50: The rapid rotation of the outer disk
Q52: The centre of our galaxy is located
Q74: The hypothesis that the Milky Way formed
Q76: Stars with a high metal abundance and
Q81: Population I stars contain more metals than
Q82: Giant molecular cloud complexes are located in
Q82: The spectrum of a population I star
Q83: The supermassive black hole at the centre
Q92: Spiral tracers tend to be old, luminous
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