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Astronomy Cast Ep. 267: Infinities
Forever is a funny thing. Today we’re going to talk about infinities. That’s right, all the different kinds of possible infinities. How you add them, subtract them, and use them to think about the...
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How Big is the Universe?
The Universe is big, but how big is it? That all depends on whether the Universe is finite or infinite. Even the word "big" is tough to get clear. Are we talking about the size of the Universe we can...
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Is the Universe Finite or Infinite?
Two possiblities exist: either the Universe is finite and has a size, or it's infinite and goes on forever. Both possibilities have mind-bending implications. In another episode of Guide to Space, we...
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