How was life born on Earth? Does it exist on other planets in the solar system or elsewhere in the universe? These questions, which have long worried a person, are devoted to the book of the famous American scientist Norman Horowitz, a major exobiologist, one of the scientific leaders of the Viking program, the purpose of which was to search for traces of life on Mars. It is addressed to readers interested in the achievements of modern science who want to better understand the world around us.