What do we know about black holes?

The video explains black holes, focusing on two types: stellar-sized and supermassive. Stellar-sized black holes form from star explosions and have intense gravitational fields. Supermassive black holes, found in galaxy centers, have masses millions to billions of times that of the Sun. Despite their mass, they are small in size. The video dispels the myth that black holes will suck us in, explaining that their gravitational influence is only significant when very close. It concludes with the mystery of what happens to matter inside black holes.

What new insight or understanding did you gain from this video?