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The universe is extremely vast, and even with modern science and technology, only a small amount is known about it. Humanity does not even have an answer to the age-old question, 'Is the universe ...

The universe’s geometry determines whether the cosmos is spatially finite or infinite. The geometry could be flat, open (meaning negatively curved), or closed (meaning positively curved). In two ...

(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?

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How many grains of sand on our planet Earth? Right at this instant, there is some gargantuan number that answers that question, though I have no idea what it is, nor how to get its value, nor even how ...