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Insert text here as from Astronomy 101 textbook. Include formula for
finding the mass from observables.
Determining the mass of Cygnus X-1 from its X-ray spectrum involves two
parts, measuring its binary period, and measuring its radial velocity. Both
of these quantities can be measured using X-ray spectra of Cygnus X-1. In
addition, some assumtions will have to be made about the inclination of
the system.
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