Manel Perucho, professor of the Department of Astronomy and Astrophysics at the University of Valencia has proposed an explanation for the origin of the deceleration of plasma jets (loss of speed along the matter and energy channels emanating from the central regions of an active galaxy), a subject that has been debated in recent decades.
Click here for original story, Plasma jet deceleration could be caused by the interaction with the stars
Source: Phys.org