Chandra’s image of this highly luminous quasar shows an enormous X-ray jet that extends at least a million light years. The jet is likely due to the collision of a beam of high-energy electrons with microwave photons. The high-energy beam is thought to have been produced by explosive activity related to gas swirling around a supermassive black hole. The length of the jet and the observed bright knots of X-ray emission suggest that the explosive activity is long-lived but intermittent. The X-ray light from PKS 1127-145 passes through a galaxy 4 billion light years away, on its way to Earth. This allowed astronomers to estimate that the gas in the intervening galaxy contained a much lower concentration of oxygen relative to hydrogen gas than does our galaxy – about 5 times lower.