Screenwriters are the ones who should do that kind of research, where necessary. The director says if he likes the script and shoots it. He's not expected to be an expert in such minutia, especially if it's not germane to the story.
I don't usually disagree with you, but isn't this akin to the bit on NEMESIS where Baird thought Geordi was an alien?
If you as director don't understand even the basics, you might be inclined to accept stuff that is less than credible, to the detriment of the story (I use the Abrams09Thing as a reference, from use of black holes to building starships on the ground because the WRITERS think a ship has to have its warp drive set up WITHIN a gravity well!)