
Everything we do here on Earth will be deleted from the cosmic record in a billion years, when the Sun will brighten and boil off all liquid water from the surface of our planet through a runaway greenhouse effect. The sturdiest structures we construct on the surface of Earth will constitute the tombstones of our civilization. This state of affairs should remind us of our personal life, where the notion of death affects what we choose to do in the limited time allotted to us. However, a cosmic time horizon of a billion years sounds so far away that we…
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