Stars, their evolution and types
In the last few years we have been able to detect a number of extra-solar planetary systems, but we cannot tell much about them. Our knowledge will improve in the next decade or two, however. It is likely that an advanced extraterrestrial civilization will know which star systems in its neighborhood are good candidates to host intelligent life, and which are not. The primary selection criteria are the type of the star, which is related to the temperature of its surface, and the size and location of its planets. As we learn more about planets and their characteristics, we should be able to apply a variety of other constraints (Chapter 6). Once an advanced society has made such an analysis, the resulting list of nearby stellar systems likely to harbor life may well be very short.
KeywordsAccretion Disk Massive Star White Dwarf Main Sequence Molecular Cloud
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