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Introduction to astrobiology
This note covers the following topics: Properties of life, The cell, Life definitions in astrobiology, Chemical properties of life, The chemical elements of life, The water molecule, Chemical bonds in biology, Functional groups in biomolecules, Biological macromolecules, Nucleic acids: RNA and DNA, Molecules used for energy exchange, Genetic sequences and classification of organisms.
Author(s): Giovanni Vladilo
38 Pages 
Astrobiology by Leiden University
This note is intended to give a complete overview of the basics of Astrobiology, as well as some idea about future developments.
Author(s): Malcolm Fridlund, Leiden University
NA Pages
Astrobiology, history, and society
This book addresses important current and historical topics in astrobiology and the search for life beyond Earth, including the search for extraterrestrial intelligence.
Author(s): Douglas A. Vakoch
NA Pages