Field of Debris?

Explanation: The discovery of additional small moons has raised concerns about the possibility of rings or other debris structures in the Pluto system that can pose hazards to New Horizons. Even a millimeter-sized pebble's impact at New Horizons' flyby speed - about 14 kilometers per second, or more than 31,300 miles per hour - could seriously damage the spacecraft.

Pluto

Image credit: John Hopkins University Applied Physics Laboratory.