The distant galaxy SMM J2135-0102, shown here in 870-micron observations by the Submillimeter Array (SMA), has been gravitationally lensed by a foreground galaxy cluster. The galaxy's light is magnified and bent by gravity to produce mirror images of each of four star-forming regions (labeled A through D). If the galaxy were seen undistorted, it would appear like the inset at upper left. Regions A and D are separated by less than 6,000 light-years. The inset at lower right shows the resolution of the SMA image.
Mark Swinbank (Durham) and Steve Longmore (SAO)