Initial Exploration of a Black Hole

As early as the Earth Era, humanity had mastered several methods of observing black holes, the primary means of observing these celestial bodies that could not be "seen."

Since they could not be directly seen like stars, black holes could only be observed indirectly. One method was stellar observation: by observing the abnormal movements of stars within a region of space over many years, one could discover a black hole there that bound those stars.

That method would not work here, because there were no stars orbiting this black hole at all.

Another method was to confirm a black hole's existence by observing its accretion disk. According to the principle of angular momentum conservation, as matter gradually approached and was drawn into a black hole, a rotating accretion disk formed outside its event horizon. Humanity could indirectly detect the black hole through thermal radiation produced by gas collisions in the central region of the accretion disk, as well as high-intensity X-rays.

Unfortunately, that method would not work here either. The matter around this black hole had long since been devoured, leaving it without an accretion disk. It was a silent black hole.

The third method was also related to stars. It combined the first two methods, determining a black hole's existence based on an astronomical system formed by the black hole and a visible star. Such systems generally had accretion disks, but this method was likewise unsuitable for the black hole before them.

The fourth was the well-known Gravitational Wave method, which determined a black hole's existence through the Gravitational Waves produced when two black holes merged. Clearly, this black hole had completed its merger long ago and had now returned to being a quiet black hole, so this method would not work either.

The reason the Probe Team from