Penrose diagram

A Penrose diagram is a way to visualize the entire structure of spacetime around objects like black holes, compactly representing infinite distances and times. It uses a special type of mapping that "compresses" infinite regions into finite areas, allowing scientists to see all possible paths light and matter can take. This helps in understanding how black holes influence the universe, how events are connected, and the nature of horizons. Essentially, it’s a clever diagram that offers a "bird's-eye view" of complex spacetime behavior within a manageable, finite illustration.