If the universe is 13.8 billion years old, why is the observable universe 46 billion light-years across? This video explains ...

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 ...

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 ...