QSO J2240+0321, Anglice Einstein Cross appellatum,[1] est quasar lente gravitationali praeditum quod recta post Lentem Huchranam, ZW 2237+030, sedet. Quattuor imagines eiusdem quasaris distantis (cum quasare in centro sito, nimis obscuro visu) circa galaxiam ob potentem lentem gravitationalem apparent.[2][3]

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QSO J2240+0321

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Nexus externi

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