An artist’s concept of Porphyrion, a jet of material 23 million light-years long that dates back to a time when the universe was less than half its present age. Credit...E. Wernquist/D. Nelson ...
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.