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TagLife (definition)

Spaceship in space above the planets in distant solar system. Elements of this image furnished by NASA.

Astrobiologist: Change How We Search For ET!

There’s a longstanding controversy in the pursuit of extraterrestrial life as to whether life forms must be carbon-based

Sara Imari Walker, of Arizona State University, puts her finger on a key issue: The discovery of life on another planet should be a momentous event for humanity, but any announcement of a biosignature detection made right now will not be a milestone but a mess, because scientists will have no consensus that we’ve even made a discovery. Here on Earth, we don’t recognize life by its atmospheric byproducts. In fact, none of our current biosignatures address the central question: What about us makes us alive? Our biosignatures are not definitive signs of life because we don’t have a coherent theory of what life is… Carl Sagan famously showed that adopting a definition that includes the ability to eat, metabolize,…