Like I said, it makes someone at Starfleet look very inept. If not Terrell, then Chekov (who was supposedly there), and if not them then Starfleet Command for not eliminating the system as a possibility.
Given it was at least 15 years earlier and Chekov apparently wasn't even bridge crew at the time, I can forgive him not immediately remembering what the big deal about Ceti Alpha was supposed to be. Why Starfleet didn't apprently take any precautions is a bit more confusing, unless we want to assume that Kirk placed warning buoys that were destroyed by the explosion as well.
Given the weather system, I just assumed there was too much atmospheric interference or what-have-you.The weirdest thing to me is that you've got a whole big group of people down on the planet, plus their ship and all their belongings, and apparently some indigenous life as well (the Ceti eel), and yet all Reliant's sensors are able to detect is "a minor energy flux reading on one dynoscanner" that they think may be nothing.
The film is good, but the entire setup defies any and all logic.