My biggest being the supernova that threatens the galaxy and black holes that sends you back in time or destroy stuff depending on what the plot requires.
's strong point has always been characterization, not science.
I mean, does anyone here actually believe that if you fly around the sun really fast that you can go backwards and forwards in time? Did anyone ever actually believe it?
There's a difference between fictional science and technology that doesn't exist and science that we know TODAY is completely wrong. Even if the future science and technology wasn't exactly right Star Trek usually tried to present it in a believable way that was consistent with the rules of its own fictional universe. Without this Star Trek ceases to be science fiction and becomes space fantasy with space magic.