Image credits: HH1/HH2 - J. Hester (ASU), WFPC2 Team, NASA; Cygnus A - C. Carilli, NRAO.
The top image shows a jet from a young star, while the bottom image shows a jet from an active galaxy. While there are underlying similarities in the physics of these objects, their scales are very different.
The Herbig Haro 1 and 2 bipolar outflow (top), with a length of around a lightyear from tip to tip, originates on a star having an age of around a million years and a mass comparable to that of the Sun.
The double radio lobes of Cygnus A (bottom) which span over 500,000 lightyears, are fed by jets of energetic particles formed near a 2.5 billion solar mass black hole.
Leeds has major research programmes in star formation, the discs around stars, and how outflows from stars and other astronomical sources affect the surrounding environments.
Further details of the research conducted by the Leeds group can be found under "research" in the navigation bar.