We find that this left over radiation from the big bang is pretty smooth. It looks more or less the same in different directions, but not exactly. There are small tations, one part in ten to five, ok? And we say, therefore, the early universe, the moment from which this radiation was omitted, which is only like 300 thousand years after the big bang, the physical world was smooth, right? That's why the radiation that we're seeing now looks smooth,. because the actual primordial plasma was smooth and homogeneous. Ah, but that's not what we see. We don't see the primordial plasma. What we see is photons, micro wave photons, landing