(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?

👉 Learn about sequences. A sequence is a list of numbers/values exhibiting a defined pattern. A number/value in a sequence is called a term of the sequence. There are many types of sequence, among ...

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 ...

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