In this book he shows his love for both astronomy and photography. He gives a lot of information about stars, globular nebula, supernovas, galaxies etc. etc. But he also explains how they are photographed! He describes all kinds of techniques that are used to make things visible that would otherwise stay undetected. The writer explains why it is better to make astronomical photos from three separate B/W plates with use of blue, green and red filters, instead of using regular colour film. He explains the reason behind using more than one plate for photographing faint objects. Or techniques like "unsharp masking" and "amplification". His story is illustrated throughout the book with many photos. Regularly the same object is shown with the use of varying techniques.