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SPEED LIMIT. “Relativistic interactions are limited by the speed of light. Since everything happens at a finite distance from everything else, relativity can only deal with the past, even if only infinitesimally in the past.” https://lnkd.in/gDaxUYAS View in LinkedIn

UNITS OF TIME. “Indeed, with a finite speed of light, everything we see is in the past. As discussed above, the whole idea of detecting the antipresent requires a preferred now. In the STH there is always a single present moment throughout both the universe and the antiuniverse.” (STH = Symmetrical Time Hypothesis). https://lnkd.in/gDaxUYAS View in LinkedIn

Brilliant series of pictures of scale changes of a butterfly wing leading to this final ornate periodic microsketeton. https://lnkd.in/dedpBqV5 View in LinkedIn

ADMONITION. “Before the phenomenon of nature it is necessary to observe, to study and to be astonished by nothing.” (Leibniz). View in LinkedIn

BLOCK UNIVERSE. “Einstein also believed in an absolute determinism, imagining a "block" of events in spacetime seamlessly extended indefinitely. This seems perfectly true for the past, but there is no evidence about the future.” https://lnkd.in/gDaxUYAS View in LinkedIn

COSMIC SLIDING SCALE. “Nothing prevents our choice of the present as this plane, and nothing prevents this plane from expanding along the time dimension as the universe expands.” https://lnkd.in/gDaxUYAS View in LinkedIn

ALIEN VIEW. “It is, however, eventually relevant to his present. In fact, it is entirely permissible in relativity, though unfashionable, to foliate (slice) spacetime in order to provide a preferred plane of simultaneity equidistant in time from the origin, throughout the universe.” https://lnkd.in/gDaxUYAS View in LinkedIn

ALIEN OBSERVED NOW. “The fact that to such an observer our now is shifted does not necessarily mean it is shifted for us, since an infinity of such observers in random positions and velocities would cancel each other out. Such an apparent shift can only occur at a distance such that our now as observed by the alien is in our past and unchangeable anyway, so what is the relevance of any alien's observation to our present?” https://lnkd.in/gDaxUYAS View in LinkedIn

NO UNIVERSAL NOW. “Since this is true of all distant moving observers with different velocities, it is deduced that there should be no preferred present. I believe this is a philosophical prejudice, and Einstein was notoriously wrong in his philosophical prejudices.” https://lnkd.in/gDaxUYAS View in LinkedIn

THE PROBLEM OF NOW. “But, according to Einstein, an alien, for example, observing us in a distant galaxy will perceive our now to be shifted into our past or future, versus its neighbor alien observing us at a somewhat different velocity.” https://lnkd.in/gDaxUYAS View in LinkedIn