I am working on a novel that uses 'gates' that for lack of space here let’s just call worm holes (any excuse works for this question). But these gates cannot bridge to each other if located in a region of space that is warped too much. So I'm looking for a proportional answer, not a calculated exact one. Example: If light (like from a star) diminishes by the inverse square law, then a similar situation of what I am looking for would be: If I arbitrarily chose the amount of light hitting the earth to be what I want for some other planet, then if I know how bright its star is compared to the Sun I can figure the distance that planet has to be to get the same amount of light as our earth does. So a star four times as luminous would require its planet to be twice as far from it as the earth is from the sun. Looked at this way, I don't need to know units in lumens, distances in meters, etc. Just arbitrary general units and a quick ratio. NOW If I were to say for instance that a gate could work if it orbited the Sun at a distance like that of earth, which is 1 AU (only an example) is there a simplified ratio that the Field Equations can be roughly equal to for at least 2 or 3 digit accuracy to be able to say another star of so many solar masses would equal some minimum distance away then for a gate at that star? I do know that it is simpler for calculations outside of a massive object rather than inside, but it is still too complicated for this Sci-Fi writer. I hope that some rough proportion can be used for distances several times the radius of the sun, again only 2 or 3 digits at least, but if 4 or more, fantastic! The story is NOT a dry text book to be checked for accuracy, but I do not want to write in things that to someone knowledgeable would laugh at as clearly off. Thank you very much for any help provided.