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Search for Extra Terrestrial Intelligence
- 7. Doles Analysis
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Dole estimated that there are 17 billion such stars in our own galaxy,
which are habitable.
Given the probability of a star of suitable size with an appropriate
period of rotation and appropriately regular orbit, Dole concluded that
it is probable that there may be 640 million habitable planets in our
galaxy alone, each of them containing some form of life or the other.
If those habitable planets are spread through out, then there is one
habitable planet in per 80, 000 cubic lightyears. So, the nearest
possible habitable planet, will be (cubic_root(80,000)) roughly 27
light years away from us.
Dole listed 14 stars within 22 light years that might possess habitable
planets. He concluded that habitable planets are most likely to be
found in the stars closest to us, Alpha Centuari, Alpha Centauri A,
Alpha Centauri B.