If parallax can be measured with an accuracy of 001 arc
If parallax can be measured with an accuracy of 0.01 arc second, and the mean density of stars in the solar neighbour is 0.1 pc^-3, how many stars can have their distance gauged via parallax?
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if parallax can be measured with an accuracy of 001 arc second and the mean density of stars in the solar neighbour is
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