Back from the dead, a black hole is erupting after a 100-million-year hiatus | Scientific American

After a 100-million-year hiatus, the supermassive black hole at the center of the galaxy J1007+3540 has erupted, emitting a one-million-light-year-long stream of star-forming particles and gas. This 'cosmic volcano' is an episodic galaxy, where the central black hole intermittently emits jets of particles and gas. Researchers believe that studying this eruption can provide insights into the structures, evolution, and influence of episodic galaxies on their surroundings.