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Ask a Spaceman!

AaS! 194: Does the Universe Rotate?

Ask a Spaceman!

Paul M. Sutter

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

4.8853 Ratings

🗓️ 21 February 2023

⏱️ 43 minutes

🧾️ Download transcript

Summary

How do we know that the universe doesn’t rotate? Why would it matter if it did? What does all this have to do with time travel? I discuss these questions and more in today’s Ask a Spaceman!

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Thanks to Cathy Rinella for editing.

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

Transcript

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0:00.0

I can say with an extreme amount of confidence that the Earth rotates.

0:15.3

And I don't think anyone disagrees with that statement.

0:18.4

In fact, I don't even think that the people who believe that the earth is flat think that it's motionless, although I could be wrong about that, but I'm not

0:26.0

willing to go out and find out for sure. So let's just take it as a given. But how can I be so

0:31.9

confident? If I point to the sky and say, hey, everything repeats every 24 hours, and it's doing that because we're spinning around, and so we get brought back to the same point of view every time, you could just counter that with a simple statement that we, the earth, is perfectly stationary, and it's the rest of the universe that's doing the rotating.

0:52.7

And this is exactly what many cultures throughout history believed.

0:57.0

Many cultures in time and space believed that the universe rotates. But we're not many cultures

1:04.9

throughout history. They were just as smart as we are for sure, but we happen to have a tool

1:09.8

for understanding the universe that they

1:11.6

didn't. Physics. And with this tool, we can say, again, with an extreme amount of confidence,

1:19.6

that it's the earth that's rotating and not the universe. There's evidence all over the place,

1:24.1

like there's the breaking of symmetry. If the earth were stationary,

1:29.6

then there would be nothing special about east versus west. A storms could come from the east

1:37.0

just as easily as they could come from the west. They could come from the north just as easily

1:42.0

as they come from the south. There should be no preferred

1:45.2

direction for wind patterns or storm patterns. And yet there is. Storms flow in one direction

1:52.5

along the equator and then another direction along the northern hemisphere and then another

1:57.0

direction along the southern hemisphere. If you're living in the United States,

2:02.3

for example, or Europe, storms will tend to come from the west and move to the east and

2:08.8

not the other way around. Yes, there are exceptions, but that's the general rule. That's the

2:13.7

general pattern. There shouldn't be a pattern if the earth isn't rotating, but the

2:18.8

rotation of the earth sets up certain wind patterns that we see. We see an asymmetry appear

...

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