Cistus, with its many hybrids and cultivars, is commonly encountered as a garden flower. The common name rockrose is applied to the species, a name also shared by the related genera Halimium, Helianthemum and Tuberaria, all in the family Cistaceae. The common name gum cistus is applied to resin-bearing species, especially C. ladanifer.
Quasars are part of a class of objects known as active galactic nuclei (AGN). Other classes include Seyfert galaxies and blazars. All three require supermassive black holes to power them.
The quasar jets that break the laws of physics: Streams are 100 times hotter than thought possible at 10 TRILLION degrees. Quasar 3C 273 was first discovered in 1963 and is the brightest in our sky. New technique combining one space and four ground telescopes was used.