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 ...
When fed with matter, such black holes eject jets of charged particles in two directions at the speed of light. If a jet ...
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 ...