More than fifty years have passed since the flask experiments by Stanley Miller...

More than fifty years have passed since the flask experiments by Stanley Miller and Harold Urey rekindled the primordial soup hypothesis for the origin of life. Scientists now realize, however, that generating miniscule amounts of a few amino acids is irrelevant to the origin of life because the chemicals in Miller and Urey's experiment were exposed to neither oxygen nor ultraviolet light. The fact that Earth never possessed measurable quantities of prebiotics {see p. 73} and that the universe appears devoid of reservoirs for life's fundamental chemical building blocks {see p. 74} also argues for the famed experiment's irrelevance. As far back as 1973, a deep sense of frustration over any possible naturalistic explanation for life's origin on Earth or anywhere else within the vast reaches of interstellar space led Francis Crick {who shared the Nobel Prize for the discovery of the double helix nature of DNA} and Leslie Orgel {one of the world's preeminent origin-of-life researchers} to suggest that intelligent aliens must have salted Earth with bacteria about 3.8 billion years ago.{24} This suggestion, however intriguing or bizarre, fails to answer the question of where the aliens might have come from. It also contradicts evidence that shows intelligent life could not have arrived on the cosmic scene any sooner than about 13.7 billion years after the cosmic origin event. The implausibility of interstellar space travel also remains an intractable problem. Ruling out a visit by aliens from a planetary system far, far away narrows the reasonable options down to one: Something or Someone from beyond the physics and dimensions of the universe, who is not subject to them, placed life and humanity in the only location in the universe at the only time in cosmic history where and when such creatures could survive and thrive.

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