I've been reading an excellent book on the building of the Palomar Observatory[0]. It's amazing how small we used to think the universe was, a few tens of thous

I've been reading an excellent book on the building of the Palomar Observatory[0]. It's amazing how small we used to think the universe was, a few tens of thousands of light years across. The book is very much a page turner. [0] https://store.palomar.caltech.edu/products/the-perfect-machine-building-the-palomar-telescope-by-ronald-florence https://store.palomar.caltech.edu/products/the-perfect-machi...