AaS! 259: Where Exactly is the Edge of the Universe?
Ask a Spaceman!4 Nov 2025

AaS! 259: Where Exactly is the Edge of the Universe?

Is the universe infinite? What about the cosmological horizons, the limits to what we can see? Will we ever know for sure what's beyond them? I discuss these questions and more in today's Ask a Spaceman!

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Hosted by Paul M. Sutter.

Episoder(272)

AaS! 99: Do We Live in the Multiverse?

AaS! 99: Do We Live in the Multiverse?

What's the difference between the universe and the multiverse? How can cosmic inflation make bubble universes? Do those universes get different physics? If I travel far enough away, will I meet…myself...

5 Mar 201935min

AaS! 98: Who's in Charge of the Quantum World?

AaS! 98: Who's in Charge of the Quantum World?

How did Max Planck accidentally discover quantum mechanics? Why is his constant so special? What happens at the quantum level? I discuss these questions and more in today's Ask a Spaceman! Support the...

19 Feb 201926min

AaS! 97: What Makes the Strong Force So Strong?

AaS! 97: What Makes the Strong Force So Strong?

Why is the strong force better known as the "color force"? What's the best way to think about protons and quarks? What do the Three Musketeers have to do with anything? I discuss these questions and m...

5 Feb 201925min

AaS! 96: Hey, Who Took All the Antimatter?

AaS! 96: Hey, Who Took All the Antimatter?

Why are matter and antimatter symmetric? What happened in the early universe to make matter win? Do we have any clue as to why? What do puppies have to do with it? I discuss these questions and more i...

15 Jan 201923min

AaS! 95: Does Light Experience Time? (And Other Mysteries)

AaS! 95: Does Light Experience Time? (And Other Mysteries)

What does 'time' mean for light? What is the real lesson of the twin paradox? How can we all agree on the true age of the universe? Why is it all so technical? I discuss these questions and more in to...

1 Jan 201927min

AaS! 94: How Did We Figure Out That Stuff Is Made of Atoms?

AaS! 94: How Did We Figure Out That Stuff Is Made of Atoms?

How and when did we realize that atoms exist? How did we learn to understand their properties? How was Ernest Rutherford hogging all the science for himself? I discuss these questions and more in toda...

18 Des 201846min

AaS! 93: Does the Oort Cloud Exist?

AaS! 93: Does the Oort Cloud Exist?

Where is the Oort Cloud and what is it made of? Why do we think some comets come from there? If the Oort Cloud exists, how did it form? I discuss these questions and more in today's Ask a Spaceman! Su...

4 Des 201841min

AaS! 92: I Give Up, What Is Time?

AaS! 92: I Give Up, What Is Time?

What makes time so hard to understand? Why is it so different from the spatial dimensions? Is time in any way connected to that most difficult of concepts, entropy? I discuss these questions and more ...

20 Nov 201836min

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