As we all know or read, the black holes do exist in our universe. Of course, it was also found that at the centre of every galaxy 🌌 there is a super-massive black hole of its own. Scientists say that we can't see them directly, nor by the experiments. But, we can discover them by few observations.
A black hole is the most densest object ever found, 'cause millions and millions and millions and millions and millions of matter sink to a least minimal volume (sometimes even a point), thereby, creating a huge gravitational force that not even light can escape the black hole from certain distance once it reached. That distance, as drawn radially about a point, is called the event horizon. Here's a small question. What is making a black hole not be seen by us?