The blazar, named J0410–0139, is located about 12.9 billion light-years away at the center of a galaxy. This makes it the ...
In 2018, a galaxy about 270 million light-years away from Earth exhibited a major increase in activity. It quieted down again ...
Using the aging Hubble Space Telescope, Achenbach spotted an unusual spiral galaxy quasar with a visible jet. This calls into ...
These galaxies emit energy from their nucleus, or center – called the active galactic nucleus. In a process called ...
A large international team of scientists has observed a phenomenon that astronomers didn't ever expect to see happen in real ...
A large international team of scientists observed a rare event in real time: a dramatic increase in radio emission and the ...
More information: Hai-Cheng Feng et al, Velocity-resolved Reverberation Mapping of Changing-look Active Galactic Nucleus NGC 4151 during Outburst Stage. II. Results of Four Seasons of Observation ...