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Using the motion of 15 stars in the Sculptor Galaxy is an insufficient data set to make generalised conclusions. How close were the 15 stars to one another? Are they gravitationally coupled? Is the Sculptor Galaxy special in any way? Is the region in which these stars reside special in any way? Who played the guitar lead on the Beetle's song "While my guitar gentle weeps"?
More data is required from many different types of Galaxies and using a randomised sample of stars within those galaxies.
Sounds interesting though,
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