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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 ...

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 ...

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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 ...

(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?

Is the universe infinite? It's one of the most profound questions we can ask, and here's the short answer: We don't know. While we have learned a great deal about the universe, a portion of the cosmos ...

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 ...