Is the universe infinite? The answer gets weird fast
This article explores the cosmological question of whether the universe is infinite or finite. It uses the analogy of Earth's curved surface to explain how a finite space can exist without having a physical edge.
Why it matters
It provides a conceptual framework for understanding complex astrophysical theories regarding the nature and geometry of the universe.
Earth has a finite surface. We can measure it, and if the planet itself were expanding, that surface area would increase over time. Surprisingly, our familiar planet also offers a useful way to think about something far harder to understand: what the universe might be like beyond the region we can observe.
The simplest assumption is that beyond our cosmic horizon, there is simply more universe. More stars. More galaxies. More AI-generated cat videos. It is similar to standing somewhere on Earth and assuming that beyond your visible horizon, there is still more Earth.
But how large is the entire universe, including everything beyond what we can see?
The frustrating answer is that we may never know.
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