Question: Cygnus X-1 is orbiting the massive star HDE226868, with a period of 5.6 days. What can you infer from this? O The mass of HDE226868.

Cygnus X-1 is orbiting the massive star HDE226868, with a period of 5.6 days. What can you infer from this? O The mass of HDE226868. O The mass of Cygnus X-1. O Nothing. (You need more information, such as the size of the orbit, to determine the mass.) O The mass of the binary system

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