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A star-system with N = 5 × 10^5 identical stars of m=1M⊙, is self gravitating and...

A star-system with N = 5 × 10^5 identical stars of m=1M⊙, is self gravitating and has a velocity dispersion of σ = 10km s^−1 and an angular half-light radius θ = 3 arc minutes. Using this info, find the distance to the system.

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