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" "[T]hus... any intelligent species would develop at least the rocket technology capable of... a travel velocity v<sub>es</sub> of 3 x 10<sup>-4</sup>c. At this velocity the travel time to the nearest stars would be between 10<sup>4</sup> and 10<sup>5</sup> years. This... would necessitate... self-repair capacity... Nuclear power-souces would supply the power... If power utilization during the free-fall period was... low, even chemical reactions could supply the power.
(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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[T]he eternal life assumption... implies... there must exist in this future (but in two precise mathematical senses, also in the present and the past) a Person Who is simultaneously transcendent to yet immanent in the physical universe of space, time, and matter. In the Person's immanent temporal aspect... changing (forever growing in knowledge and power), but in the... transcendent eternal aspect, forever complete and unchanging. How this comes about as a matter of physics will be described...
Hunter has pointed out that by using a Jupiter swingby to approach the Sun and then giving a velocity boost at perihelion, a solar system escape velocity... is possible with present-day chemical rockets... [M]ost other stars should have planets (or companion stars) with characteristics sufficiently close to... the Jupiter-Sun system to use this launch strategy in reverse to slow down in the other solar system.
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I shall provide a physical foundation for eschatology—the study of the ultimate future—by making the physical assumption that the universe must be capable of sustaining life indefinitely... for infinite time... [W]e have to have some theory for the future of the physical universe—since it unquestionably exists— and this is the most beautiful postulate: that total death is not inevitable. All other theories of the future necessarily postulate the ultimate extinction of everything... there is nothing uglier than extermination. We physicists know that a beautiful postulate is more likely to be correct than an ugly one. Why not adopt the Postulate of Eternal Life, at least as a working hypothesis?