Roger Penrose, “The Cyclic Universe” (Open Agenda, 2021)
New Books in Science, Technology, and Society
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How Do We Measure Distances Times?
The structure of space time depends on two things. One is the lat cones, or the al cones, which we' just had t and that's most of the metric. In relativity, a photon, on the other hand, goes along the cones. Now suppose we yele me. Therefore, iam going to talk about this picture. The first tick for all these clocks coming up from that point would have their first tick on this bowl shaped surface here. And in the second theye to cer, they sort of hyperboloids, if you know what that means. So it's a question, how crowded are these surfaces? The light cone is the nine numbers. The tenth,
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