AaS! 55: Does dark energy exist?

Ask a Spaceman!

Paul M. Sutter

Astrophysics, Science, Cosmos, Holes, Black, Astronomy, Natural Sciences, Universe, Cosmology, Space, Physics

4.8 • 853 Ratings

🗓️ 2 May 2017

⏱️ 37 minutes

🔗️ Recording | iTunes | RSS

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Summary

How do we measure the expansion history of the universe? Why are supernovae so dang useful? Come on, what’s with this “dark energy” business? I discuss these questions and more in today’s Ask a Spaceman!

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Music by Jason Grady and Nick Bain. Thanks to WCBE Radio for hosting the recording session, Greg Mobius for producing, and Cathy Rinella for editing.

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

Transcript

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0:00.0	You know what time it is.
0:09.0	It's time for Ask a Space Man.
0:10.6	I'm your host Paul Sutter.
0:11.7	You've got questions and I've got answers.
0:14.3	You know how the show works, but let's expand on the topic one more time.
0:18.6	You go online to Twitter or Facebook.
0:20.6	Use the hashtag Ask a Space man. Send me some questions. You go online to Twitter, Facebook, use the hashtag Ask a Spaceman,
0:22.5	send me some questions. You can also send questions by emailing Ask a Spaceman at gmail.com.
0:28.5	Going right to Ask aSpaceman.com. There you'll also find show notes, places, comments,
0:32.7	all that good stuff. You can also follow me directly on Twitter and Facebook. My name is at Paul Matt Sutter.
0:40.2	That's my name. And that's, this is my game, which is answering your questions. We have one
0:45.2	simple goal with this show. Complete knowledge of time and space. And on the road to complete
0:51.7	knowledge of time and space, we have today's subject, which is not the subject I planned it was going to be.
0:59.1	So a lot of you, a significant number of you have asked about dark energy.
1:06.4	I get it.
1:07.6	You're curious about it.
1:09.2	It's a weird subject.
1:30.8	It's describing the ultimate fate of the universe. It's mysterious. What could be better? So loud and clear, I have your messages and your questions. But I do want to talk about what we think dark energy might be because surprise, surprise, we actually have no clue what it is.
1:32.8	But we have some ideas.
1:34.4	And I do want to do an episode on that.
1:36.6	But first, I want to talk about how we know it exists in the first place.
1:42.9	I want to lay that groundwork. I want to have us there
	...

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