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Twilight zone has three meanings: 1. now obsolete concept in planetary astronomy that the Planet Mercury had a presumably habitable (twilight zone) between its Hot and brightside and Cold Nightsides- and this was a possibly life abode. the concept assumed that Mercury did not rotate. It has since been found out Mercury does rotate but is too hot to support known life- as was long known. 2. an oceanographic term relating to how far down sunlight is visible in the ocean for visibility purposes of Marine life such as fish. The answer,. as with anything weather-oriented is a variable and not a constant. finally- the popular science-ficiton and fantasy show hosted by Rod Serling. It has been argued he got his pen name from the popular Drug Store at Journal Square , the Silver Rod, and inverted it-Rod Sterling= hence Serling, maybe Sterling optical got after him!

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16y ago

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