Galaxy cluster

BRADAC/HST/W. M. Keck Observatory

Composite image of the galaxy cluster from three different filters on the Hubble Space Telescope. The wave charts (insets at left) show spectra of the multiply imaged systems. The fact that they share peaks at the same wavelength shows that they belong to the same source. At bottom right, the Keck I and Keck II Telescopes at Hawaii’s the W. M. Keck Observatory.

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