The true science behind SETI’s hunt for clever aliens

The real science behind SETI’s hunt for intelligent aliens

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In 1993, a staff of scientists printed a paper within the scientific journal Nature that introduced the detection of a planet harboring life. Utilizing devices on the spacecraft Galileo, they imaged the planet’s floor and noticed continents with colours “appropriate with mineral soils” and agriculture, massive expanses of ocean with “spectacular reflection,” and frozen water on the poles. An evaluation of the planet’s chemistry revealed an environment with oxygen and methane so considerable that they have to come from organic sources. “Galileo discovered such profound departures from equilibrium that the presence of life appears probably the most possible trigger,” the authors wrote.

However probably the most telltale signal of life was measured by Galileo’s spectrogram: radio transmissions from the planet’s floor. “Of all Galileo science measurements, these indicators present the one indication of clever, technological life,” wrote the authors.

The paper’s first writer was Carl Sagan, the astronomer, writer, and science communicator. The planet that he and his co-authors described was Earth.

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