Photo taken on June 19, 2015 shows the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) at the Xinglong ...

A pair of quasars that existed when the universe was only 3 billion years old has been spotted by the Hubble Space Telescope.

A Yale-led team of astronomers has detected an intensely brightening and dimming quasar that may help explain how some objects in the early universe grew at a highly accelerated rate. The ...

"Three quarters of these sources are quasars and galaxies with active nuclei (these are supermassive black holes with masses of 10 to 100 million solar masses). The remaining 250,000 sources include ...