GPS satellites are in danger from the accumulation of space junk because even a

small piece of debris can cause significant damage if it collides with a satellite.  

The problem of space junk is getting worse as more and more satellites are launched into orbit.  

There are now millions of pieces of debris orbiting Earth, and the number is growing every year. 

The most likely way for a GPS satellite to be damaged by space junk is a collision. 

When two objects collide in space, the impact can be much more destructive than a similar collision on Earth. 

This is because there is no atmosphere in space to slow down 

the objects, so they collide with much greater force.