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Astrobiology is the study of the circumstellar habitable zone (CHZ), that (1) seeks to improve protection for the human body while in the vacuum of outer space, and (2) compare CHZs of extrasolar planetary systems. Astrobiology also investigates the extremities of the CHZ to determine if and what microbial life can exist. It also attempts to study various states of water, where H20 occurs outside of Earth, preferably large quantity locations throughout the Solar System.