Baby, I saw you first

 作者:相里礼     |      日期:2019-03-07 01:15:07
By Hazel Muir A TEAM of astronomers is claiming the first sighting of a new-born quasar swaddled in a thick cloud of dust. “People have been looking for these things for a long time,” says team leader Colin Norman of Johns Hopkins University in Baltimore. Other astronomers, however, dispute the American claim. Quasars are extremely bright sources of radiation, which astronomers believe are powered by giant black holes that feed on the stars, gas and dust that surround them. Until now, all the quasars found shine brightly in visible light as well as X-rays, says Norman. But in the 1980s,