What practical benefit often results from the technological development required to search for biosignatures on distant exoplanets?

Answer

Innovations in sensor technology applicable to terrestrial monitoring.

The engineering challenge of developing instruments sensitive enough to detect trace atmospheric gases on distant planets drives innovations in areas like spectroscopy and sensor technology, which subsequently find uses in environmental monitoring or medical diagnostics on Earth.

What practical benefit often results from the technological development required to search for biosignatures on distant exoplanets?
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