Scientists have many big questions to tackle about the universe, including how big it actually is. But even the proposed answers aren't straightforward.

(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?

A thin shell of air wraps around Earth, stretching about 20 miles above the surface. This invisible veil is packed with tiny molecules that sustain life. Just beyond this fragile layer lies the ...

It turns out a monkey – given an infinite amount of time and a typewriter – wouldn't be able to write Shakespeare before the universe ends, according to a new study. HARRY SHEARER: (As Charles ...

I don’t think the universe is infinite, but instead is in the form of the “surface” of a four-dimensional Euclidean hypersphere, so is finite. Nor do I think our universe is the only one: there may be ...

This story is part of our Cosmic Perspective series, in which we confront the staggering vastness of the cosmos and our place in it. Read the rest of the series here. In a sense, we are at the centre ...

The surface of Earth is finite. We can measure it. If it was expanding, then its size would grow with time. And once again, ...

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