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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 Origin and Evolution of Habitable
This note describes the origin and development of life on the planet Earth within the context of an evolving universe. It begins with an overview of the origins of the universe from the "Big Bang" to our own solar system and then integrate the principles of physics, chemistry, geology and biology to study the origins of life on Earth.
Author(s): Professor Dr. Harold Geller
NA Pages