It took five more hours for photosynthesis to begin – and until midday for the atmosphere to become rich in oxygen. If you assume that the Earth coalesced an instant after midnight, it took around four hours for the first life to appear: microscopic organisms clustered around hydrothermal vents beneath young oceans. One common analogy illustrates this by telling the story of our planet’s 4.7-billion-year history as if it were the 24 hours of a single day.
If you consider our place in the history of the Universe, it is easy to see humans as an insignificant temporal speck, flickering in an unspeakably vast cosmos.
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