Libertarian International Organization & Liberal League| Voluntary Governance, Rights, Progress
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The matter is of great interest to LIO curator Michael Gilson-De Lemos, (MG) who in 1976 wrote a controversial thinkpiece noting that the speed limit lacked direct physical demonstration from the nature of space-time itself, and suggesting it was more of the nature of the once common view thatl no typical material could go faster than sound. "It is like epicycles in Ptolemaic Theory. All the evidence was for them, as means to predict planetary motions, except there was no proof of the epicycles or why they had to be. The theory described but did not define."
LIO Fellow Star Trek creator Gene Roddenberry also encouraged the visioning process, saying that "There is a real cultural barrier on the subject and challenging it has become academic suicide," suggesting that even if it was a barrier in some sense it could be circumvented by e.g. possible warp or other drives that changed the structure of underlying space-time. Roddenberry and MG worked with Feynman to bring in hand young scientists who might put the matter on a sounder basis.
LIO takes no position on technical matters but encourages voluntary efforts to examine evidence, especially when there appeares to be a taboo on the subject.