What represents the primary challenge for scientists when analyzing potential biosignatures on Mars?
Answer
Every biological signature has a possible geologic lookalike
The difficulty in finding life lies in the fact that almost every indicator typically associated with biology, such as the chemical energy gradients that create leopard spots, can also occur naturally through non-biological geological processes. Scientists must therefore determine if the structural arrangements are too orderly or complex to have been created by geology alone.
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Signs of Life on Mars? NASA's Discovery, Explained | NOVA | PBS
NASA's perseverance rover finds possible signs of life on Mars
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