The Great Silence: Only 4 in 10,000 Galaxies May Host Intelligent Aliens

Extraterrestrial life capable of communicating through space interstellar space might not be able to develop if the home planet doesn’t have plate tectonics, and just the right amount of water and dry land.

Plate tectonics is absolutely essential if complex life is to evolve, argue Robert Stern of the University of Texas at Dallas and Taras Gerya of ETH Zurich in Switzerland. SoilComplex multicellular life arose during a period known as the Cambrian explosion, 539 million years ago.

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