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The long-term survival of the human species is demonstrably incompatible with remaining a single-planet civilization. To confine our entire biological and cultural heritage to a terran cradle - one subject to apocalyptic asteroid impacts, devastating super-volcanic eruptions, and increasingly severe anthropogenic…

• Which astrophysicist argues that prioritizing celestial settlements acts as an irresponsible evasion of our duty to repair our terrestrial home?
• Which astrophysicist asserts that establishing permanent bases beyond our atmosphere is an indispensable safeguard against total human eradication?