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Method to determine the amount of reflected starlight necessary for an exoplanet to be visible from a given distance/angle?

What is the method to determine the amount of reflected starlight necessary for an exoplanet to be visible from a given distance/angle? (Not from occlusion but actually visible on its own.) Further, ...
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Were the Voyager Golden Records tested for being decoded?

I was wondering if the microgroove golden records they put on the Voyager spacecraft, along with instruction on how to decode it, were first put to the test with the subjects most likely to decode ...
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Is it likely OMG particle (and those like it) originate from alien spacecraft propulsion systems?

Is it likely that Ultra High Energy Cosmic Rays (UHECRs) like the OMG particle come from alien spacecraft propulsion systems? I realize this is a bit "out there", but my reasoning behind it is that ...