How big is the Universe? Is it finite or infinite? These questions have puzzled astronomers, scientists, and curious minds for centuries. In this journey through the cosmos, we’ll explore the limits ...

(via Sabine Hossenfelder) Is the universe really infinite? Or could it close back on itself like a sphere? If it’s infinite, how can it expand? And is it true that there might be copies of you in it?

However, we do know that the universe is larger than 93 billion light-years across. This is the diameter of the sphere of the “observable universe” that we find ourselves at the center of.

Whenever we look out at the Universe, no matter how powerful our tools or how clever our techniques, there’s always a limit to what we’re capable of observing. No photons, or quanta of lig ...