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              Three high-redshift quasars detected by Chandra

              Using NASA's Chandra spacecraft, astronomers have discovered three new ultraviolet-bright radio-quiet quasars at high redshift and measured their basic X-ray properties. The newly found quasi-stellar object turns out to be ...

              Why skinks that lost their legs evolved new ones

              A team of researchers affiliated with Clark University, the Museum of Natural History, Yale University and the University of Massachusetts Amherst, has developed a theory to explain why skinks living in the Philippines lost ...

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              香港最准一肖中特公开选料1