WASHINGTON, July 8 : A quasar — among the universe's most luminous and energetic objects — is a supermassive black hole caught in the act of guzzling matter at the heart of a galaxy. Scientists have now found quasars dating to so early in cosmic history that they are baffled as to how they already existed at that primordial time.Using the European Space Agency's Euclid space telescope, researchers said they have identified 31 ancient quasars, observations that add to the mystery of how the universe was far more advanced in its earliest stages than previously believed.These included the two earliest quasars known, dating to a bit more than 13.1 billion years ago when the universe was 5 per cent of its current age, about 670 million years after the inceptive Big Bang event. They both shine w