A Biography of Earth Across the Age of Animals
Some 4 billion years after its creation, a small planet circling an unexceptional star in the outlying Orion-Cygnus spiral arm of the Milky Way enjoyed a brief and bustling season of complex life. The planet blushed with a breathable atmosphere, and for a few hundred million years it also hosted temperatures that somehow stayed within a surprisingly narrow window — one amenable to a biosphere that…
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