Ah, you spotted this, "...or a historic close encounter with a rogue planet...", nice job! My first edit had almost 600 words, and it took three, four, maybe five tries to get it under the limit. But I wanted to keep that in. :^) Seems like a good enough pretext to make this a twofer topic.
The asteroid belt makes no sense to me without it, particluarly because of the large size of irregular mineral "particles," but now that we see so many crossing orbits, it becomes more obvious that such is only a matter of time.
You might find it fascinating that this perspective of preparation for eventual catastrophe is elemental to an honest understanding of Genesis. It surely ain't no ex nihilo Creation story.
