What specific limitation dictates that confirming life on an exoplanet will likely remain remote sensing for the foreseeable future?

Answer

Confirming life requires incredibly detailed atmospheric biosignatures that are difficult to obtain remotely.

Due to the enormous light-years involved, confirming life will depend on interpreting remote sensing data, and achieving the level of certainty we have about our own solar system planets remains extremely challenging.

What specific limitation dictates that confirming life on an exoplanet will likely remain remote sensing for the foreseeable future?

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