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OCR: vet, f01 bright as they do and to away they rmust produ prodi ligious energy energy in fact that SOr eally astronomers suggested were not so far away therefore were not sO e after all In this case know the distance of +1 gravitational "lens" We also know the lens affects objects behind trates gravitational lensing that quasars really are cably distance and just as ly energetic as they were thought to be Finally gravitationa bout solves an important ther avdto must ipious energ astrononmers strates lensine guasars listance enereetic thouchtto