They co-evolve. And so astronomers have used this evidence to say, well, if they evolve together, then this idea of this process of feedback a redder color, for example.
So we threw back and forth a bunch of layout sketches. So the Red Waste got a lot redder .
And we can tell when the star is kind of wobbling back and forth in our point of view, red shift and blue shift. The light will get a little redder when it's coming towards us-- or I'm sorry, going away from us and a little bluer when it's coming towards us.
all I had to do was work. That's fabulous. I can do that, right? Yes, sir. male audience #1: Was your hair redder than it is now? Nathan Seidle: A little runner, yeah, that was like bright red after Halloween.
That's because we're in that disk. The Galactic Center itself is composed of older, redder stars. It appears yellow to the eye.
Now this occurs for any moving source of light. But when we see a car at night and its headlights are coming towards us, we don't notice them being slightly bluer as it heads towards us and redder as it goes away from us. That would be really cool to have some special glasses that allow you to perceive those tiny Doppler effects. It requires specialized
They co-evolve. And so astronomers have used this evidence to say, well, if they evolve together, then this idea of this process of feedback Which means that all those blue young sort of shorter lived stars are going to die out and leave you with the redder , older, longer-lived stars,
But before I do get started with more technical stuff, I thought I'd show you these travel posters. This says "Kepler-186f, where the grass is always redder on the other side." And that star system I just showed you, it's a small red star, not a big yellow star like our Sun. So you might imagine that if most of the energy output is coming at red wavelengths, maybe the vegetation is a different color to harvest light
that's the way around it is yes so if you've got a a blue number that means that a large proportion a blue color that's um a large proportion of the species are still intact um as it gets redder it means an increasingly large proportion of being lost and there's all sorts of different ways you can add those numbers up obviously the main conclusions to this are pretty robust to
Planes, the moon, the sun, tides-- everything rings this machine. It's colder, right? It's redder than when it was created.
So it's way, way back pretty much at the dawn of formation of evolution of galaxies. It used to do a lot more and there are other galaxies, redder galaxies that don't do this at all anymore.
Where's my little bowl? Absolutely not. Would it be black beans or kidney beans where it's like the water is redder or darker?
But the point is that the universe is expanding. We've known that ever since Hubble's work, which showed that the light from galaxies is shifted toward longer wavelengths, redder wavelengths. And the greater the distance, the greater is this redshift.
It works for light, as well. So a galaxy flying away from you will have its light stretched to long, lower frequencies, which makes it look redder . We call this redshift in astronomy.