For more than two decades, the quasar PHL 1811 has been considered the prototype of a rare class of "intrinsically X-ray weak" quasars, thought to produce unusually little X-ray radiation. But in 2024, the Einstein Probe spacecraft caught the object in a bright X-ray flare. In a new study, astr...
Source: [Phys.org](https://phys.org/news/2026-08-famous-oddball-quasar-isnt-ray.html)