Every galaxy in the universe has its unique finger print. In clusters, there's a huge amount of dark matter and light bending is proportional to how concentrated it is. So you end up seeing multiple images of the same single object. The way we know these are multiple copies of the same object is they have the same spectra. We've actually seen allof these configurations now with the huple space telescope,. And verified that they are copies of each other by taking their spectra.

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