No. The light from these jets travels many many magnitudes farther than the actual material. You wouldn't want to be within a few million light years of it but

No. The light from these jets travels many many magnitudes farther than the actual material. You wouldn't want to be within a few million light years of it but these particles have mass and will be slowed by all of the matter they interact with in space. The vacuum of space still has roughly an atom per cubic centimeter, which really adds up over the distances we're talking about here. Edit: Left out a fairly important word. few million light years*