Homes to Civilization? We do not yet know how many stars have Earth-like planets

Question

Homes to Civilization? We do not yet know how many stars have Earth-like planets, nor do we know the likelihood that such planets might harbor advanced civilizations like our own. However, some stars can probably be ruled out as candidates for advanced civilizations. For example, given that it took a few billion years for humans to evolve on Earth, it seems unlikely that advanced life would have had time to evolve around a star that is only a few million years old. For each of the following stars, decide whether you think it is possible that it could harbor an advance civilization. Explain your reasoning in one or two paragraphs. a. 10M sun main-sequence star b. 1.5M sun main-sequence star c. 1M sun helium core-fusion star d. Red supergiant

Explanation / Answer

a ) The life time of 10 M massive star is of the order of few millions because due to its internal gravity it will burn fast. we cannot find an advanced civilization.

b) 1.5M sun main-sequence star , this is slightly less than massive star , life time is of the order of few millions only . We cannot find an advanced civilization.

c) 1M sun helium core-fusion star , this is star which will exist after red gaiant phase. Life time is nearly few billion years. There can be advanced civilization but it can be destryed in the later stellar phase.

d) This phase will occur after massive star starts burning . Less life time order of millions of years. We cannot find an advanced civilization..

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