Conny Aerts

You get pissed off musicians.

That's what you get.

Exactly.

I like that experiment, actually.

You can really hear that.

But the symphony is destroyed.

That's what the audience would say.

Now, for me, as an astro-seismologist, the frequencies of the waves get shifted.

Right?

Yeah, they get shifted because of the extra motion due to the rotation.

And we can measure that.

And we're not measuring that at the surface of the star, but inside the star where the starquake has its strongest energy.

And so what we have come to realize is that the theory of how stars evolve, relying on how they rotate in their interior, is quite off.

It's not very good.

And that's not surprising, right?

Because we could only measure, before we had starquakes, we could only measure the rotation of the star at its external layer.

Like for the sun, you see the tiny little dark spots of the sun rotating around?

If you're patient, every 26 days, you see them back in your line of sight.

So the sun rotates with a period of about 26 days, but that's just the outer layers.

It doesn't say at all how it rotates in its interior.