https://bigthink.com/high-culture/carl-sagan-an-amazing-life-lesson/
Carl Sagan's wife, Ann Druyan, recalls how the famed astronomer faced his death with the same courage he brought to his life and work.
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https://www.universetoday.com/articles/carl-sagans-crazy-idea-life-inside-comet
Space Habitat designs are enormous, high-tech structures. Carl Sagan had a different idea: comets as space habitats.
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