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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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If life is adaptive as we believe, why isn't there gaseous dwelling life on Jupiter?

When considering the theory of evolution, if life can evolve from water dwelling creatures to land dwelling, why (theoretically) is there not life on every planet in our solar system?