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.
Recent Examples of quasar from the Web. Gas surrounding a galaxy in the line of sight could absorb some of a quasarâs light. â , The Atlantic, The Intergalactic Winds That Built the Milky Way, 27 July 2017. What caught Chiabergeâs eye was the quasarâs location, 35,000 light-years from the center of its galaxy.