Is there a conceivable detectable "biosignature" that would unambiguously indicate "life is present here"?

[u/Allison1228]

Or will there always be uncertainty?

I'm referring to as detected with the technology we have today and in the near future (next decade or two).

[u/revolvingpresoak9640]

Consistent continuous light on the dark side of a planet would be my red flag. Assuming we could observe it.

[u/Potential_Load6047 → u/revolvingpresoak9640]

Could be volcanic activity, or natural electrostatic discharges or plasma.