Pretend you are standing on a train moving at 100mph. You throw a baseball forward at 40mph. Relative to you, on the train, the baseball is moving at a speed of 40mph. However, relative to a stationary observer on the ground, the ball is mvoing at 100 + 40 = 140mph. It's all about your frame of reference.

To an observer running at 10mph beside the train, the ball would be moving at a speed of 130mph relative to them.

In the case of the edges of space, that space itself is the train, the particles are the baseballs and we are the stationary observer.

Originally posted by Howetzer
Does that mean to imply that the particles really are NOT going faster than the speed of light, but appears that way?
They are not going faster than light relative to the space (the train) that they are in. Therefore, no laws of relativity are being broken.