Asteroid storm
From Memory Alpha, the free Star Trek reference.
An asteroid storm is an astronomical phenomenon that poses a hazard to starships.
In 2367, Deanna Troi remarked that Captain Jean-Luc Picard had traveled light years, dodged asteroid storms, and braved hostile aliens, but cringed at being asked to assume a parental role for Jono. (TNG: "Suddenly Human")
