The Callisto Group and the Impending Catastrophe

Everything is changing: new apprenticeships, new training. The Callisto Group is finding more responsibilities trust upon them, and less free time. Then they discover a comet streaking toward the station.
JJ isn't worried. The closer the comet gets the more concerned are the rest of the inhabitants. What does JJ know that no one else knows? All the calculations point to an impending catastrophe.
When questioned, JJ talks about faith, but is that enough? Are they in the direct path of an object somewhat larger than Callisto station itself? Is it the end of Callisto Station and the Callisto Group?