The "point of no return" at a black hole is known as the event horizon. This is the boundary surrounding a black hole beyond which no light or information can escape due to the immense gravitational pull. Once an object crosses the event horizon, it is inevitably drawn towards the singularity at the center of the black hole.

Understanding the concept of the event horizon is crucial in comprehending the behavior and effects of black holes in the universe. It marks the point where the gravitational forces are so strong that not even light can break free, leading to the mysterious and captivating nature of these cosmic phenomena.