Figure 1

(Upper) The Hubble Space Telescope picture of the distant galaxy 1938+666 which has been imaged into an Einstein ring by an intervening galaxy. The intervening galaxy shows up as the bright spot in the centre of the ring. The picture was taken in the infra-red region of the spectrum and the computer-generated colour of the image has been chosen simply for ease of viewing.

(Lower) The MERLIN radio picture of the radio source 1938+666 embedded in the distant galaxy. The incomplete ring (or arc) shows that the radio source is not perfectly aligned with the lens galaxy and the Earth. The lens galaxy does not contain a radio source and hence does not show up in this picture. The colours are computer-generated and represent different levels of radio brightness.