A fascinating piece of historical scientific writing, written in 1913 by E. Walter Maunder (F.R.A.S.), the Superintendent of the Solar Dept. at the Royal Observatory in Greenwich. The book is a snapshot in time showing the evolution of thinking on the solar system and cosmology. The author considers, in fine detail, the plausibility of life on other planets within our solar system, the requirements for such life, and the barriers that life faces. Whilst many of the beliefs and conventions stated within the book are now out of date, it is enlightening to hear how theories and opinions have changed in just over 100 years. This is perfect listening for anyone with an interest in scientific history and cosmology.