Experiments by Stanley Miller in the 1950s demonstrated that the first organic molecules on Earth

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Stanley Miller's experiments simulated the conditions of Earth's early atmosphere and demonstrated that organic molecules, specifically amino acids, could be formed abiotically in this environment. Specifically, Miller's apparatus contained a reducing atmosphere of hydrogen, methane, ammonia, and water vapor, which he subjected to electrical sparks to mimic lightning. This process produced a variety of organic molecules, including amino acids. While it is still debated exactly what the composition of Earth's early atmosphere was, Miller's experiments demonstrated that simple organic molecules could form under plausible conditions.

Experiments by Stanley Miller in the 1950s Demonstrated That the First