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Pandora's Cluster and site of its nearby parallel field
Site of parallel field observation made at same time as Pandora's Cluster image

Graphic: Ann Feild (STScI)

The Frontier Fields project consists of 12 images, one of each of the six galaxy clusters that can be used as natural "lenses" and one nearby patch of sky — called a "parallel field" — for each cluster. The parallel fields will be new deep-field observations that will greatly increase the number of distant galaxies astronomers have observed.