Michael Blanton discusses why the universe can look clumpy nearby yet comparatively uniform when averaged over very large scales. He points to the cosmic microwave background and galaxy surveys as complementary evidence for that large-scale picture.
192 words · auto-generated from the episode video
14:06I think that the strongest evidence for that comes from the cosmic microwave background. >> Oh, okay, fair. >> Where it's where it's just very clear that like that part of the sky and that part of the sky, which have never talked to each other, are >> the same temperature. >> Yeah. >> Um So So, I think that that is you know, is the strongest evidence, but it is true that um with with the largest volume sample of SDSS, we were able to do that for the galaxies as well. We could answer the question like how homogeneous is the universe. Um and uh and and we
14:47did we did have a a quantitative paper, you know, based on the volume we surveyed, which which showed that it's very very uniform. >> Yeah, it is very very uniform. >> on those large scales, right? On the small scales, everything's clumped, but once you're at hundreds of millions of light-years or a billion light-year scales, then everything's [clears throat] pretty much the same anywhere. >> it's like soup. >> Yeah. >> Yeah, very cool. Um So, now I want to
AstronomyAstrophysicsOpen DataCosmology