This is the first of a divided two‎-part softcover edition of the ‎"‎Lectures in Astrobiology Volume I‎"‎ containing the sections ‎"‎General Introduction‎"‎‎,‎ ‎"‎The Early Earth and Other Cosmic Habitats for Life‎"‎ and ‎"‎Appendices‎"‎ including an extensive glossary on Astrobiology‎.‎ ‎"‎Lectures in Astrobiology‎"‎ is the first comprehensive textbook at graduate level encompassing all aspects of the emerging field of astrobiology‎.‎ Volume I of the Lectures in Astrobiology gathers a first set of extensive lectures that cover a broad range of topics‎,‎ from the formation of solar systems to the quest for the most primitive life forms that emerged on the Early Earth‎.‎