The largest known black hole jets, 23 million light years across, have been discovered in the distant universe. This pair of particle beams launched by a supermassive black hole is over a hundred times larger than our galaxy,

Scientists have found the biggest pair of black hole jets ever seen. Such jets are vast blasts of radiation and particles that erupt out of supermassive black holes. Milky Way jets are the largest galaxy-made structures in the universe.

An artist's illustration of the longest black hole jet system ever observed. Nicknamed Porphyrion after a mythological Greek giant, these jets span roughly 7 megaparsecs, or 23 million light- years. That is equivalent to lining up 140 Milky Way galaxies back-to-back. Credit: E. Wernquist / D. Nelson (IllustrisTNG Collaboration) / M. Oei