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" "[T]he probability of the evolution of creatures with the technological capability of interstellar communication within five billion years after the development of life on an Earth-like planet is less than 10<sup>-10</sup>, and thus we are the only intelligent species now existing in this Galaxy.
(born February 1, 1947) is an American mathematical physicist and cosmologist, holding a joint appointment in the Departments of Mathematics and Physics at Tulane University. Tipler has written books and papers on the based on Pierre Teilhard de Chardin's religious ideas, which he claims is a mechanism for the resurrection of the dead. He is also known for his theories on the (Tipler time machine) and for the , an argument that no intelligent life exists outside of the Solar System. His work has attracted criticism, notably from systems theorist George F. R. Ellis who has argued that his theories are largely pseudoscience.
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Once the exploration and/or colonization of the Galaxy has begun, it can be modeled... by the mathematical theory of island colonization... developed... by MacArthur & Wilson... since... islands... are closely analogous to stars in the heaven, and von Neumann machines are even more closely analogous to biological species.
One avoids... contradiction between contingency and necessity by avoiding... sharp distinction between God and... reality. This... distinction... leads to gnostic heresy: ...a wholly other God... divorced from our ...world. It also leads... to the Problem of Evil... naturally resolved in the Omega Point Theory.
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The biologists argue that the number of evolutionary pathways leading from one-celled organisms to intelligent beings is minuscule when compared with the total number of evolutionary pathways, and thus even if we grant the existence of life on 10<sup>9</sup> to 10<sup>10</sup> planets in our Galaxy, the probability that intelligence has arisen... [there] on any planet but our own is still very small. I agree...