Q: The rotation curve of a disc galaxy (also called a velocity curve) is a plot of the orbital speeds of visible stars or gas in that galaxy versus their radial distance from that galaxy's centre. It is typically rendered graphically as a plot, and the data observed from each side of a spiral galaxy are generally asymmetric, so that data from each side are averaged to create the curve. A significant discrepancy exists between the experimental curves observed, and a curve derived from theory. The theory of dark matter was postulated to account for the variance.\n\nAnswer this question: what is the rotation curve of a spiral galaxy? Let's give stream of consciousness first:
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To answer the above question, the relevant sentence is: The rotation curve of a disc galaxy (also called a velocity curve) is a plot of the orbital speeds of visible stars or gas in that galaxy versus their radial distance from that galaxy's centre. Therefore, the final answer is a plot of the orbital speeds of visible stars or gas in that galaxy versus their radial distance from that galaxy 's centre.
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