It's probably quite common out there. I'm not quite sure if it works like that but usually the standard model for finding exo-planets has been through the detection of stars that "wobble" in relation to their background. they then suspect that something is exerting gravity on it and wait for the star to dim and when it does they realise a massive object such as a planet is passing in front of it.
Presumably that method's a bit more difficult in the case of multiple-star systems (which are said to make up the majority of stars out there) because they would wobble anyway, as they're gravitionally bound to each other?... That would make the detection of planets orbiting one of them more difficult?
Actually no forget that. That's probably crap. Stars that orbit each other are probably way, way further in distance to each other than stars are to their planet, so you wouldn't "see" them "wobble". A whole human lifetime would be nowhere near long enough to see binary stars complete one single orbit around each other.
Those results aren't too surprising, particularly Scots and English being more similar to each other than northern and southern Welsh are to each other. Wales is much more geographically divided than England and Scotland are, and all of human knowledge regarding speciation supports that geographic isolation creates vastly different genetic subsets.
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