13.8 billion years ago, what we know as our Universe began with the hot Big Bang. It's been expanding and cooling ever since, up through and including the present day. From our point-of-view, we can ...

(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 ...

Director of The Australian National University Institute for Space and the Advanced Instrumentation Technology Centre, Australian National University We’ve known for some time now our universe is ...

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