(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?

If the universe has only existed for a finite time, then we couldn’t actually have an infinitely large universe emerging from a finite initial state. However, we don’t know if the initial state of the ...

We preselected all newsletters you had before unsubscribing.