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Image sources
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Hubble Interacting Galaxy NGC 5257 : By NASA, ESA, the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration, and A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University) [Public domain], from Wikimedia Commons
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Hubble ultra deep field.jpg : By NASA and the European Space Agency. [Public domain], from Wikimedia Commons
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m57_the_ring_nebula-587px.jpg : By The Hubble Heritage Team (AURA/STScI/NASA) [Public domain], from Wikimedia Commons
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KeckObservatory20071020.jpg : By SiOwl [CC BY 3.0] from Wikimedia Commons