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Shadow life
Shadow life is a hypothesis proposed by cosmologist Paul Davies, which suggests that if life has evolved on Earth more than once, microorganisms may exist on Earth which has no evolutionary connection with any other known form of life.〔 〕 He thinks that if scientists discover an alternate form of microbial life on Earth, the odds are good that life is common elsewhere in the universe.〔〔 He suggests that possible indicators could be alternate biochemistries such as right-handed amino acids, or a different genetic code, or even another kind of chemical for its genetic material that are not nucleic acids (DNA nor RNA) chains or biopolymers.〔 The hypothesis speculates that the descendants of any "second genesis" may have survived until today in a shadow biosphere.〔
==See also==
*Biological dark matter
*Hypothetical types of biochemistry
*Shadow biosphere
*''The Eerie Silence''
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Shadow life」の詳細全文を読む
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