AaS! 106: How Do We Measure the Expansion of the Universe?
Ask a Spaceman!18 Jun 2019

AaS! 106: How Do We Measure the Expansion of the Universe?

What's the deal with redshift? How can we actually interpret velocities when it comes to cosmic expansion? And what's with the recent tension over measuring the expansion rate? 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: John, Matthew K, Helge B, Justin Z, Matt W, Justin G, Kevin O, Duncan M, Corey D, Kirk B, Barbara K, Neuterdude, Chris C, Erik M, Steve C, Digitalneo, Erik M, Tim R, Neil L, Gordon M, Joe R, Neil P, Gabriella G, Tom S, Bryan D, Irene P, Dustin R, Matt C, Iothian53, Steve P, Debra S, Ken L, Alberto M, Ron W, Chris L, Mark R, Alan B, Stephen J, David P, John F, Maureen R, Frank T, Craig B, Jesse A, Ron S, Steven L, Mark R, Ulfert B, Dave L, Stace J, S Stark, Richard K, Vladimir Z, Carol S, Stephen M, Grace M, Jeremy K, Russell W, Thomas S, David B, Tamara F, Robert B, Fr Bruce W, Catherine R, Nicolai B, Sean M, Nate H, and Edward K!

Music by Jason Grady and Nick Bain. Thanks to Cathy Rinella for editing.

Hosted by Paul M. Sutter, astrophysicist at The Ohio State University, and the one and only Agent to the Stars (http://www.pmsutter.com).

Episoder(272)

AaS! 202: Could the Earth Leave the Solar System?

AaS! 202: Could the Earth Leave the Solar System?

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AaS! 201: How Does Light Slow Down?

AaS! 201: How Does Light Slow Down?

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AaS! 200: What are the Top 5 Mysteries in Astronomy?

AaS! 200: What are the Top 5 Mysteries in Astronomy?

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AaS! 199: What are the Top 5 Discoveries of All Time in Astronomy?

AaS! 199: What are the Top 5 Discoveries of All Time in Astronomy?

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2 Mai 202341min

AaS! 198: What's So Weird About Black Hole Shadows?

AaS! 198: What's So Weird About Black Hole Shadows?

How does a black hole make a shadow? What can we learn from it? What are we seeing when we look at a black hole? I discuss these questions and more in today's Ask a Spaceman! Support the show: http://...

18 Apr 202329min

AaS! 197: Which is Better, Human or Robotic Exploration?

AaS! 197: Which is Better, Human or Robotic Exploration?

What are the advantages of robotic exploration of the solar system? What are the limitations? Is there any situation where human exploration is better? I discuss these questions and more in today's As...

4 Apr 202334min

AaS! 196: Could We Ever Build a Dyson Sphere?

AaS! 196: Could We Ever Build a Dyson Sphere?

What are Dyson spheres? What would be involved in building one? How much energy would it cost, and could we ever pay it back? I discuss these questions and more in today's Ask a Spaceman! Support the ...

21 Mar 202337min

AaS! 195: How Cold Can Space Get?

AaS! 195: How Cold Can Space Get?

What's the temperature of deep space? Can it get any colder than that? How do we even define temperature when there's nothing around? I discuss these questions and more in today's Ask a Spaceman! Supp...

7 Mar 202328min

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