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! 228: Can a Galaxy Be Destroyed?

AaS! 228: Can a Galaxy Be Destroyed?

Can galaxies ever get destroyed? What happens to their stars? Do galaxies ever die? I discuss these questions and more in today's Ask a Spaceman! Support the show: http://www.patreon.com/pmsutter All...

16 Jul 202430min

AaS! 227: Where is the Center of the Universe?

AaS! 227: Where is the Center of the Universe?

What does it mean for the universe to have a center? Could we ever travel to ours? What is a singularity? I discuss these questions and more in today's Ask a Spaceman! Support the show: http://www.pat...

2 Jul 202435min

AaS! 226: Does the Universe Get Shorter When You Go Faster?

AaS! 226: Does the Universe Get Shorter When You Go Faster?

How does length contraction work in relativity? Do moving objects really get shorter? What about from their perspective? How are we supposed to make sense of any measurement? I discuss these questions...

18 Jun 202436min

AaS! 225: What is the Cosmic Flaw That Shouldn't Exist?

AaS! 225: What is the Cosmic Flaw That Shouldn't Exist?

What is the "cold spot" on the cosmic microwave background? Why shouldn't it exist? What are some possible explanations for it, and why are they unsatisfying? I discuss these questions and more in tod...

4 Jun 202440min

AaS! 224: Can Life Survive on Locked Planets?

AaS! 224: Can Life Survive on Locked Planets?

How do planets get tidally locked? What are these systems typically like? Can life find a home in such a challenging environment? I discuss these questions and more in today's Ask a Spaceman! Support ...

21 Mai 202436min

AaS! 223: Why is it So Hard to Return to the Moon?

AaS! 223: Why is it So Hard to Return to the Moon?

If we went to the Moon already, why can't we go back so easily? What technology have we lost? What are we trying to do differently? I discuss these questions and more in today's Ask a Spaceman! Suppor...

7 Mai 202433min

AaS! 222: What is the Most Distant Thing We Can See?

AaS! 222: What is the Most Distant Thing We Can See?

What's the most distant thing we can see with the naked eye? What about with a telescope? What about at other wavelengths? Is there anything more to see? I discuss these questions and more in today's ...

16 Apr 202434min

AaS! 221: Will Emergent Gravity Rewrite Physics?

AaS! 221: Will Emergent Gravity Rewrite Physics?

What is "emergence" in physics and why is it a big deal? What would it mean for gravity to be emergent? How would we have to rewrite the laws of physics? I discuss these questions and more in today's ...

2 Apr 202434min

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