AaS! 251: Are the Cosmic Voids Really Empty?
Ask a Spaceman!8 Jul 2025

AaS! 251: Are the Cosmic Voids Really Empty?

How do we actually define voids? Are there regions within them that are truly empty? What would it be like to be inside one? I discuss these questions and more in today's Ask a Spaceman!

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Hosted by Paul M. Sutter.

Episoder(274)

AaS! 236: How Exactly Do Black Holes Merge?

AaS! 236: How Exactly Do Black Holes Merge?

How do black holes get close enough to merge? What causes them to emit gravitational waves, and where do the waves come from? What does the merger process look like? I discuss these questions and more...

19 Nov 202433min

AaS! 235: Is it Time to Redefine the Planet?

AaS! 235: Is it Time to Redefine the Planet?

How did Pluto get demoted? What makes a planet a planet anyway? Why do we now have so many different kinds of planets, and should we make things simpler? I discuss these questions and more in today's ...

5 Nov 202436min

AaS! 234: How Could We Turn the Sun into a Telescope?

AaS! 234: How Could We Turn the Sun into a Telescope?

How do gravitational lenses work? Where would a spacecraft need to be to use the Sun's gravity as a telescope? What could we learn about exoplanets with this on weird trick? I discuss these questions ...

15 Okt 202433min

AaS! 233: Why Do We Care About Methane on Mars?

AaS! 233: Why Do We Care About Methane on Mars?

What's behind the Martian Methane Mystery? Is it a sign of life, or just some strange chemical process? Or are we just fooling ourselves? I discuss these questions and more in today's Ask a Spaceman! ...

1 Okt 202432min

AaS! 232: Is Space Tourism a Good Idea?

AaS! 232: Is Space Tourism a Good Idea?

Why are private space companies pushing tourism? Is there a future for tourism in space? Is this an overall good thing for space exploration, or just a distraction? I discuss these questions and more ...

17 Sep 202430min

AaS! 231: What Made the Local Bubble?

AaS! 231: What Made the Local Bubble?

Where do we live within the galaxy? What shapes the local bubble? How long will we be inside it? I discuss these questions and more in today's Ask a Spaceman! Support the show: http://www.patreon.com/...

3 Sep 202429min

AaS! 230: Is the Universe Making Any New Galaxies?

AaS! 230: Is the Universe Making Any New Galaxies?

How do galaxies form and evolve? Is the universe still making new ones? What will happen to the current galaxies in the universe? I discuss these questions and more in today's Ask a Spaceman! Support ...

20 Aug 202426min

AaS! 229: Is the James Webb Breaking Cosmology?

AaS! 229: Is the James Webb Breaking Cosmology?

What has the James Webb Space Telescope learned so far? Is it finding galaxies that "break" cosmology? What will we learn next? I discuss these questions and more in today's Ask a Spaceman! Support th...

6 Aug 202435min

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