And so these are all Flickr images, and they've all been related spatially in this way.

So let's first consider a spatially flat model, with exactly critical density. This is also known as

So you see elements here of stabilized slide show or panoramic imaging, and these things have all been related spatially.

The first one would be a flat, spatially flat matter dominated model, which is also known as Einstein de Sitter model.

In fact, Milne was the first one to introduce cosmological principle. So this was spatially often negative curvature model with a zero density.

So, let's look at the luminous baryons first, those would be mostly in galaxies, and the way to do this is to integrate them spatially.

To spatially denote the pedestrian realm, to protect the pedestrians from the vehicles in the carriageway, to filter the sunlight onto the sidewalk, and to soften the hardscape of the buildings and to create a ceiling a vaulted ceiling over the street, at its best.

This is spatially flat model, good old Euclidean geometry, it follows the spacial relativity and it is realized in Sanskrit there no matter at all, it's any empty universe, just specs, so you can think of it as galaxies having no mass of their own just being test particles to show us how the coordinates are expanding as you will see how, Hubble's law follows immediate and directly from it.