We Still Don't Fully Understand Time
Martin Rees traces humanity’s expanding temporal horizon from religious chronologies and early clocks to geology, evolution and modern cosmology. Radioactive dating places Earth billions of years in the past, while astronomy projects a vastly longer future beyond the Sun. Rees argues that the present century is unusually consequential because one species can reshape the biosphere and perhaps its own evolution, even as political planning grows increasingly short-term.
Opens on time.com · Curated by GlobeRead
GlobeRead's Take
Scientific progress has expanded the human timeline in both directions while politics has compressed its field of view. We can reconstruct billions of years and model stellar futures, yet institutions struggle to plan beyond elections, quarterly results or a few decades. That mismatch makes deep time more than an intellectual spectacle: it is a moral scale against which present choices look unusually large.nnHistorical chronology illustrates how measurement disciplines imagination. Archbishop Ussher’s exact creation date offered confidence before evidence could support it, while geology and Darwin required durations long enough for landscapes and life to transform gradually. Radioactive dating and cosmology later pushed the beginning of the solar system and universe into billions of years. Each extension displaced humanity from a short, prearranged story into a much larger and less centered history.nnThe future produces an even stronger reversal. Our Sun is not halfway through its life, and any distant beings witnessing its end may be as unlike us as we are unlike simple organisms. Meanwhile, genetic modification and machine integration could change the pace and direction of human development far faster than natural selection. Speculation here serves a sober purpose: it exposes how provincial our assumptions about lifespan, scarcity and intelligence may be.nnWe picked Rees’s essay because it connects cosmic perspective to responsibility without pretending that scale automatically generates wisdom. Readers interested in history, astronomy and long-term thinking will appreciate its movement from ancient calendars to possible posthuman descendants. Its sharpest tension is political: the first species capable of understanding deep time is also capable of damaging the future while focusing on the immediate. Cosmic scale here becomes a demand for institutional imagination, not an excuse for human insignificance. How might today’s priorities change if we treated this century as a hinge rather than simply our turn?
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