Alien life: how would we know?

  title={Alien life: how would we know?},
  author={Margaret A. Boden},
  journal={International Journal of Astrobiology},
  pages={121 - 129}
  • M. Boden
  • Published 1 April 2003
  • Physics
  • International Journal of Astrobiology
To recognize alien life, we would have to be clear about the defining criteria of ‘life’. Metabolism – in other words, biochemical fine-tuning – is one of these criteria. Three senses of metabolism are distinguished. The weakest allows strong artificial life (A-life): virtual creatures having physical existence in computer electronics, but not bodies, are classed as ‘alive’. The second excludes strong A-life but allows that some non-biochemical A-life robots could be classed as alive. The third… 
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