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a) An unmanned Spaceship is sent to the vicinity of a Black Hole, and revolves around...

a) An unmanned Spaceship is sent to the vicinity of a Black Hole, and revolves around it on a circular trajectory with radius 1,115 kilometers. During the time that - according to the spaceship's clock - one day went by, on the surface of planet Earth one day, six hours and 24 minutes went by. What is the mass of the Black Hole?

b) Is the trajectory of the Spaceship within the event-horizon or outside of it?

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