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A comment on How would we know whether there is life on Earth? This bold experiment found out. Parent comment
For example, passing light through a hydrogen gas cloud will remove some red/IR wavelengths from the end result.
We can measure those missing wavelengths and figure out what gasses it's passed through
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For example, passing light through a hydrogen gas cloud will remove some red/IR wavelengths from the end result.
We can measure those missing wavelengths and figure out what gasses it's passed through