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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Big thanks to my top Patreon supporters this month: Justin G, Chris L, Alberto M, Duncan M, Corey D, Michael P, Naila, Sam R, Joshua, Scott M, Scott M, Louis M, John W, Alexis, Gilbert M, Rob W, Jessica M, Jules R, Jim L, David S, Scott R, Heather, Mike S, Pete H, Steve S, Lisa R, Kevin B, Aileen G, Steven W, Deb A, Michael J, Phillip L, Steven B, Mark R, Alan B, Craig B, Mark F, Richard K, Stephen J, Joe R, David P, Justin, Tracy F, Ella F, Thomas K, James C, Syamkumar M, Homer V, Mark D, Bruce A, Tim Z, Linda C, The Tired Jedi, Lode D, Bob C, Red B, Stephen A, James R, Robert O, Allen E, Michael S, Reinaldo A, Sheryl, David W, Chris, Michael S, Erlend A, James D, Larry D, Karl W, Den K, Edward K, Catherine B, John M, Craig M, Scott K, Vivek D, Barbara C, Brad, Azra K, Steve R, and Narrative Dude!

Hosted by Paul M. Sutter.

Episoder(276)

AaS! 35: What Are "Virtual Particles"?

AaS! 35: What Are "Virtual Particles"?

What are virtual particles? What do they have to do with waving fields around? And why can't physicists use meaningful jargon words? I discuss these questions and more in today's Ask a Spaceman! Suppo...

5 Jul 201636min

AaS! 34: What Is the Great Attractor?

AaS! 34: What Is the Great Attractor?

What is the so-called Great Attractor? What's the Zone of Avoidance, and is it scary? What makes galaxies move in the first place? I discuss these questions and more in today's Ask a Spaceman! Support...

21 Jun 201639min

AaS! 33: What If the Moon Disappeared?

AaS! 33: What If the Moon Disappeared?

What would happen if the moon disappeared tomorrow? What makes it so special in the first place? Does it really *do* anything useful? I discuss these questions and more in today's Ask a Spaceman! Supp...

7 Jun 201630min

AaS! 32: Where Do Nebulae Come From?

AaS! 32: Where Do Nebulae Come From?

How are nebulae formed or created? Where do they go when they're done being nebulae? How is it linked to the formation of stars? I discuss these questions and more in today's Ask a Spaceman! Support t...

17 Mai 201636min

AaS! 31: How Can the Universe Expand Faster Than Light?

AaS! 31: How Can the Universe Expand Faster Than Light?

How can the universe expand faster than the speed of light? What does it mean for Special Relativity to be "local"? Is there a conflict between General and Special Relativity? I discuss these question...

3 Mai 201635min

AaS! 30: 2nd-Grade Question Bonanza!

AaS! 30: 2nd-Grade Question Bonanza!

It's a BONANZA, featuring a bunch of questions from second-graders! Including: Where's the edge of the universe? How many rings does Saturn have? Are there Martians? And so much more in today's Ask a ...

19 Apr 201627min

AaS! 29: Why Does E=mc^2?

AaS! 29: Why Does E=mc^2?

Why does E=mc^2? Where does it come from? What's the significance of that famous equation? I discuss these questions and more in today's Ask a Spaceman! Support the show: http://www.patreon.com/pmsutt...

5 Apr 201637min

AaS! 28: What's the Point in Talking About Science?

AaS! 28: What's the Point in Talking About Science?

In this very special episode, I discuss the importance of communicating science, a cool new project I'm working on (songofthestars.org), and how arts and science can be married to reveal the beauty of...

15 Mar 201644min

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