Book 8, Question 116
Why Do Biosignatures Need Careful Checking?
Biosignatures need careful checking because non-living chemistry can fake life-like signals! A biosignature is a sign that life might be present, like a certain gas or pattern. So scientists demand many lines of evidence before they celebrate.
More fun facts
- A biosignature is anything, like a molecule or a shape in rock, that could be evidence of life now or in the past.
- A 'potential' biosignature is one that might come from life but needs more study before scientists decide.
- Oxygen or another gas that living things use could be a biosignature in a planet's air.
- Layered minerals left by stromatolites, mats built by microbes, could be a biosignature in Mars rocks.
- Scientists practice spotting biosignatures on Earth, a world where we already know life exists.
- Finding an ocean on a planet is one step in collecting clues about possible life.
Sources: NASA, NASA Science, Smithsonian Magazine, NASA
Questions kids ask
What is a stromatolite?
It is a layered rock built up over time by mats of tiny microbes.