The Fullness of Space - Gareth Wynn-Williams - Google Books

https://books.google.de/books?id=wjxrloC2gyMC&pg=PA42#v=onepage&q&f=false

A brief glance at the night sky reveals a remarkable fact about the Universe: it is extremely patchy. The light we see on a moonless night comes from bright specks we call planets and stars. Between the stars we see blackness. Most of astronomy, not to…