Extremely Rare Triple Quasar Found
Royal Astronomical Society said:
Quasars are extremely bright and powerful sources of energy that sit in the centre of a galaxy, surrounding a black hole. In systems with multiple quasars, the bodies are held together by gravity and are believed to be the product of galaxies colliding.
It is very difficult to observe triplet quasar systems, because of observational limits that prevent researchers from differentiating multiple nearby bodies from one another at astronomical distances. Moreover, such phenomena are presumed to be very rare.