"I believe as a matter of faith that the extension of space travel to the limits of the solar system will probably be accomplished in several decades, perhaps before the end of the century. Pluto is 4000 million miles from the Sun. The required minimum launching velocity is about 10 miles per second and the transit time is 46 years. Thus we would have to make the velocity considerably higher to make the trip interesting to man. Travel to the stars is dependent on radically new discoveries in science and technology. The nearest star is 25 million million miles way and requires a travel time of more than four years at the speed of light. Prof. Dr. Ing. E. Sanger has speculated that velocities comparable with the speed of light might be attained in the next century, but such extrapolation of current technology is probably not very reliable."
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Original Language: English
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Sources
Hugh L. Dryden in: Popular Mechanics, Vol. 116, No. 3, ISSN 0032-4558, Hearst Magazines, September 1961, p. 262
https://en.wikiquote.org/wiki/Pluto
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Pluto
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