Is Darwinian Evolution Universal?
After a triumphant landing, the Curiosity rover is ready to search Mars for signs of past life or suitability for life. Several readers have raised concerns that NASA scientists might fail to recognize life if it isn't based on carbon or is otherwise radically different from our kind of life. That's been a concern for NASA, and so in the 1990s, the space agency convened a panel to try to define life. The panel put evolution front and center: Life, the panel decided, is self-sustaining chemical system capable of Darwinian evolution.
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