In the layered search strategy, what is the primary method associated with Level 3 (Galactic Scale) targets?

Answer

Radio/optical signal detection (SETI searches)

The third level of the search, focusing on the galactic scale, prioritizes the detection of signals, typically via radio or optical means, often associated with SETI efforts.

In the layered search strategy, what is the primary method associated with Level 3 (Galactic Scale) targets?

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