This section begins at the same point as the last two sections, i.e. with a topic that first came up during the time I was writing my Ph.D. thesis at the University of Michigan. In Section 4.2, I described calculations by NASA scientist Michael Hart concerning the width of the liquid water habitable zone (HZ) around the Sun (Hart, 1978). We might call that the ‘instantaneous’ HZ, as it applies to a given instant in the Sun’s evolution. Hart also introduced the concept of the continuously habitable zone (CHZ), which is the region that remains habitable for...
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