These objects are powered by gravitational accretion from supermassive black holes.
The first "triple" example of these astronomical entities was discovered in 2007 by researchers at the Mauna Kea observatory. The Lyman Alpha Forest was discovered through the observation of one of these objects. The presence of neutral hydrogen in the intergalactic medium results in a suppression of EÂ·M radiation at wavelengths below the Lyman alpha line in these objects, in a feature called the (*) Gunn-Peterson trough. In 1979, imaging of the double-example of one of these objects provided the first observation of gravitational lensing. These objects are powered by gravitational accretion from supermassive black holes. For 10 points, name these extremely energetic active galactic nuclei, which are classified as either "radio-quiet" or "radio-loud".
The first "triple" example of these astronomical entities was discovered in 2007 by researchers at the Mauna Kea observatory.
quasar(s)