Observations show the universe appears flat, yet its true size and global shape beyond the observable horizon may remain forever unknown.

The surface of Earth is finite. We can measure it. If it was expanding, then its size would grow with time. And once again, good ol' Earth helps us understand what the universe might be doing beyond ...

Thinking about the edge of the universe is one of those ideas that fascinates pretty much everyone. We can map galaxies, study distant light, and track how fast everything is spreading out, but the ...