Taking Alien Life Seriously: The Origins of Exobiology

In nineteen sixty, Stanford geneticist Joshua Lederberg made a bold proposal: that humanity should search scientifically for life beyond Earth. Per JSTOR Daily, he coined the term 'exobiology' to legitimize the pursuit and argued for careful investigation of potential microbes and microscopic life. But Lederberg faced an unexpected obstacle—popular culture. Science fiction's obsession with hostile alien invasions had shaped public imagination in ways that threatened scientific credibility. He had practical concerns too: Soviet plans to detonate a nuclear bomb on the Moon, he worried, might contaminate the lunar surface with Earth microbes and spoil a unique research opportunity. Early exobiologists fought hard for spacecraft sterilization and investigated the chemical origins of life itself. The field struggled to secure funding because it crossed traditional scientific disciplines, yet Lederberg's vision endured: Carl Sagan and others pursued exobiology, and it eventually became central to NASA's hunt for life on Mars and beyond.

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