Measurements of ancient light from the cosmic microwave background suggest that the universe is remarkably flat. But that does not prove it is infinite, because the observable cosmos could be only a small patch of a much larger curved universe. Space could even be flat while wrapping around on itself in exotic ways.
Is the universe infinite? The answer gets weird fast. The answer gets weird fast Science News from research organizations Is the universe infinite. 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. It is similar to standing somewhere on Earth and assuming that beyond your visible horizon, there is still more Earth.
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