Skyfall and Black Hole

120 Million light-years away, a black hole appeared out of thin air. It has no eruption remnants, but it is steadily devouring the stars. Scientists around the world are debating its cause: primordial black hole? High dimensional projection? Dark matter condensation? After three years of observation, numerous hypotheses emerged and fell silent. In the end, it became an ordinary unsolved mystery in the universe, like an endless book on a bookshelf. --- This short story only has one chapter. I encourage myself to write a good long story.