The boundary beyond which nothing, not even light, can escape

The center of a black hole

The region of spacetime where gravity is strongest

The point of no return

Albert Einstein

Stephen Hawking

Marten Kruskal

Roger Penrose

The geometry of spacetime around a black hole

The gravitational field of a black hole

The motion of objects in the vicinity of a black hole

The evolution of a black hole over time

The black hole region and the white hole region

The past and future light cones

The ergosphere and the event horizon

The singularity and the horizon

It separates the black hole region from the white hole region

It is the boundary beyond which nothing can escape

It is the point of no return

It is the singularity

The point where spacetime curvature becomes infinite

The center of a black hole

The point of no return

The event horizon

The region of spacetime outside the event horizon where objects can be dragged along by the black hole's rotation

The region of spacetime inside the event horizon

The singularity

The white hole region

The region of spacetime inside the event horizon

The region of spacetime outside the event horizon where objects can be dragged along by the black hole's rotation

The singularity

The region of spacetime beyond the event horizon from which nothing can escape

It provides a visual representation of the geometry of spacetime around a black hole

It allows us to understand the behavior of objects in the vicinity of a black hole

It helps us to understand the formation and evolution of black holes

All of the above

A two-dimensional representation of the geometry of spacetime around a black hole

A three-dimensional representation of the geometry of spacetime around a black hole

A diagram that shows the motion of objects in the vicinity of a black hole

A diagram that shows the evolution of a black hole over time

The Penrose diagram is a simplified version of the Kruskal diagram

The Penrose diagram is a more detailed version of the Kruskal diagram

The Penrose diagram is a different representation of the same spacetime geometry as the Kruskal diagram

The Penrose diagram is a completely different diagram that is not related to the Kruskal diagram

It is easier to understand

It is more detailed

It is more accurate

It is more versatile

It is less detailed

It is less accurate

It is less versatile

It is more difficult to understand

The Kruskal diagram

The Penrose diagram

Both diagrams are equally common

Neither diagram is commonly used