Color image of the cluster taken with Hubble Space Telescope (images in three different filters were combined to make an RGB image). Credit: Bradac/HST/W. M. Keck Observatory
Color image of the cluster taken with Hubble Space Telescope (images in three different filters were combined to make an RGB image). In the inset we show three spectra of the multiply imaged systems. They have peaks at the same wavelength, hence showing that they belong to the same source. Credit: Bradac/HST/W. M. Keck Observatory