What critical physical limitation reduced the scientific confidence in the 'fossil' shapes found within the Martian meteorite ALH84001?
Answer
They were too small, down to tens of nanometers, to contain the molecular machinery required for Earth-like life.
The 'fossil' shapes observed were often too small, measuring down to tens of nanometers, which is too small to accommodate the molecular machinery like DNA and ribosomes necessary for known Earth-like life, which requires about a 200-nanometer sphere.
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