Re: would attempt to deduce its position from the gravitational effects it might have on nearby known entities. What am I missing... There probably are NO "nea

Re: would attempt to deduce its position from the gravitational effects it might have on nearby known entities. What am I missing... There probably are NO "nearby known entities". Planet 9 is probably further away than most detectable objects. The only reason it would possibly be found while "nearby" objects would not is because it's bigger. And it's probably so far away that its gravitational tug is very slight on the big planets that are easy to measure. The article mentioned it may tug the outer gas giants by a "dozen meters" off course from models having no Planet 9 in them. That requires a really powerful "ruler" to detect.