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You repeatedly measure the radial velocity of what seems to be a single main-sequence star like the Sun, but find that it is in fact orbiting in a tight orbit around another object that remains unseen. From measurement of the velocity and orbital period, you calculate that the unseen object has a mass 20 times that of the Sun-like star. Why might this object be a black hole?
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A software application that enables the electronic handling of recruitment needs, streamlining the hiring process by sorting through applicants.
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