Bingo. As I've said before, we've never gotten an explanation for why Ceti Alpha VI blew up. Didn't hurt THE WRATH OF KHAN one bit, nor did the four subsequent movies feel compelled to explain it, even though it led to Khan vowing vengeance on Kirk, which led to Spock dying, etc. Romulus is toast, this has had far-reaching implications throughout the Quadrant, end of story. No technobabble necessary.