A black hole is a celestial body with extremely high density and strong gravity.

The strong gravity prevents not only matter but even light from escaping, so the center of the hole looks like a black hole.

Black holes are still a mystery, but recent surveys by spacecraft have revealed their existence little by little.

It is believed that most black holes are located in the center of galaxies.

A project by an international research team to photograph black hole shadows using telescopes around the world succeeded in taking the world's first direct image of the BX323 black hole in the Meredith Galaxy on February 10, 2022.